CHAPTER 12

Mr Godwin's conjecture concerning the indefinite prolongation of human

life--Improper inference drawn from the effects of mental stimulants on

the human frame, illustrated in various instances--Conjectures not

founded on any indications in the past not to be considered as

philosophical conjectures--Mr Godwin's and Mr Condorcet's conjecture

respecting the approach of man towards immortality on earth, a curious

instance of the inconsistency of scepticism.

Mr Godwin's conjecture respecting the future approach of man towards

immortality on earth seems to be rather oddly placed in a chapter which

professes to remove the objection to his system of equality from the

principle of population. Unless he supposes the passion between the

sexes to decrease faster than the duration of life increases, the earth

would be more encumbered than ever. But leaving this difficulty to Mr

Godwin, let us examine a few of the appearances from which the probable

immortality of man is inferred.

To prove the power of the mind over the body, Mr Godwin observes, "How

often do we find a piece of good news dissipating a distemper? How

common is the remark that those accidents which are to the indolent a

source of disease are forgotten and extirpated in the busy and active?

I walk twenty miles in an indolent and half determined temper and am

extremely fatigued. I walk twenty miles full of ardour, and with a

motive that engrosses my soul, and I come in as fresh and as alert as

when I began my journey. Emotion excited by some unexpected word, by a

letter that is delivered to us, occasions the most extraordinary

revolutions in our frame, accelerates the circulation, causes the heart

to palpitate, the tongue to refuse its office, and has been known to

occasion death by extreme anguish or extreme joy. There is nothing

indeed of which the physician is more aware than of the power of the

mind in assisting or reading convalescence."

The instances here mentioned are chiefly instances of the effects of

mental stimulants on the bodily frame. No person has ever for a moment

doubted the near, though mysterious, connection of mind and body. But

it is arguing totally without knowledge of the nature of stimulants to

suppose, either that they can be applied continually with equal

strength, or if they could be so applied, for a time, that they would

not exhaust and wear out the subject. In some of the cases here

noticed, the strength of the stimulus depends upon its novelty and

unexpectedness. Such a stimulus cannot, from its nature, be repeated

often with the same effect, as it would by repetition lose that

property which gives it its strength.

In the other cases, the argument is from a small and partial effect, to

a great and general effect, which will in numberless instances be found

to be a very fallacious mode of reasoning. The busy and active man may

in some degree counteract, or what is perhaps nearer the truth, may

disregard those slight disorders of frame which fix the attention of a

man who has nothing else to think of; but this does not tend to prove

that activity of mind will enable a man to disregard a high fever, the

smallpox, or the plague.

The man who walks twenty miles with a motive that engrosses his soul

does not attend to his slight fatigue of body when he comes in; but

double his motive, and set him to walk another twenty miles, quadruple

it, and let him start a third time, and so on; and the length of his

walk will ultimately depend upon muscle and not mind. Powell, for a

motive of ten guineas, would have walked further probably than Mr

Godwin, for a motive of half a million. A motive of uncommon power

acting upon a frame of moderate strength would, perhaps, make the man

kill himself by his exertions, but it would not make him walk a hundred

miles in twenty-four hours. This statement of the case shews the

fallacy of supposing that the person was really not at all tired in his

first walk of twenty miles, because he did not appear to be so, or,

perhaps, scarcely felt any fatigue himself. The mind cannot fix its

attention strongly on more than one object at once. The twenty thousand

pounds so engrossed his thoughts that he did not attend to any slight

soreness of foot, or stiffness of limb. But had he been really as fresh

and as alert, as when he first set off, he would be able to go the

second twenty miles with as much ease as the first, and so on, the

third, &c. Which leads to a palpable absurdity. When a horse of spirit

is nearly half tired, by the stimulus of the spur, added to the proper

management of the bit, he may be put so much upon his mettle, that he

would appear to a standerby, as fresh and as high spirited as if he had

not gone a mile. Nay, probably, the horse himself, while in the heat

and passion occasioned by this stimulus, would not feel any fatigue;

but it would be strangely contrary to all reason and experience, to

argue from such an appearance that, if the stimulus were continued, the

horse would never be tired. The cry of a pack of hounds will make some

horses, after a journey of forty miles on the road, appear as fresh,

and as lively, as when they first set out. Were they then to be hunted,

no perceptible abatement would at first be felt by their riders in

their strength and spirits, but towards the end of a hard day, the

previous fatigue would have its full weight and effect, and make them

tire sooner. When I have taken a long walk with my gun, and met with no

success, I have frequently returned home feeling a considerable degree

of uncomfortableness from fatigue. Another day, perhaps, going over

nearly the same extent of ground with a good deal of sport, I have come

home fresh, and alert. The difference in the sensation of fatigue upon

coming in, on the different days, may have been very striking, but on

the following mornings I have found no such difference. I have not

perceived that I was less stiff in my limbs, or less footsore, on the

morning after the day of the sport, than on the other morning.

In all these cases, stimulants upon the mind seem to act rather by

taking off the attention from the bodily fatigue, than by really and

truly counteracting it. If the energy of my mind had really

counteracted the fatigue of my body, why should I feel tired the next

morning? if the stimulus of the hounds had as completely overcome the

fatigue of the journey in reality, as it did in appearance, why should

the horse be tired sooner than if he had not gone the forty miles? I

happen to have a very bad fit of the toothache at the time I am writing

this. In the eagerness of composition, I every now and then, for a

moment or two, forget it. Yet I cannot help thinking that the process,

which causes the pain, is still going forwards, and that the nerves

which carry the information of it to the brain are even during these

moments demanding attention and room for their appropriate vibrations.

The multiplicity of vibrations of another kind may perhaps prevent

their admission, or overcome them for a time when admitted, till a

shoot of extraordinary energy puts all other vibration to the rout,

destroys the vividness of my argumentative conceptions, and rides

triumphant in the brain. In this case, as in the others, the mind seems

to have little or no power in counteracting or curing the disorder, but

merely possesses a power, if strongly excited, of fixing its attention

on other subjects.

I do not, however, mean to say that a sound and vigorous mind has no

tendency whatever to keep the body in a similar state. So close and

intimate is the union of mind and body that it would be highly

extraordinary if they did not mutually assist each other's functions.

But, perhaps, upon a comparison, the body has more effect upon the mind

than the mind upon the body. The first object of the mind is to act as

purveyor to the wants of the body. When these wants are completely

satisfied, an active mind is indeed apt to wander further, to range

over the fields of science, or sport in the regions of. Imagination, to

fancy that it has 'shuffled off this mortal coil', and is seeking its

kindred element. But all these efforts are like the vain exertions of

the hare in the fable. The slowly moving tortoise, the body, never

fails to overtake the mind, however widely and extensively it may have

ranged, and the brightest and most energetic intellects, unwillingly as

they may attend to the first or second summons, must ultimately yield

the empire of the brain to the calls of hunger, or sink with the

exhausted body in sleep.

It seems as if one might say with certainty that if a medicine could be

found to immortalize the body there would be no fear of its [not] being

accompanied by the immortality of the mind. But the immortality of the

mind by no means seems to infer the immortality of the body. On the

contrary, the greatest conceivable energy of mind would probably

exhaust and destroy the strength of the body. A temperate vigour of

mind appears to be favourable to health, but very great intellectual

exertions tend rather, as has been often observed, to wear out the

scabbard. Most of the instances which Mr Godwin has brought to prove

the power of the mind over the body, and the consequent probability of

the immortality of man, are of this latter description, and could such

stimulants be continually applied, instead of tending to immortalize,

they would tend very rapidly to destroy the human frame.

The probable increase of the voluntary power of man over his animal

frame comes next under Mr Godwin's consideration, and he concludes by

saying, that the voluntary power of some men, in this respect, is found

to extend to various articles in which other men are impotent. But this

is reasoning against an almost universal rule from a few exceptions;

and these exceptions seem to be rather tricks, than powers that may be

exerted to any good purpose. I have never heard of any man who could

regulate his pulse in a fever, and doubt much, if any of the persons

here alluded to have made the smallest perceptible progress in the

regular correction of the disorders of their frames and the consequent

prolongation of their lives.

Mr Godwin says, 'Nothing can be more unphilosophical than to conclude,

that, because a certain species of power is beyond the train of our

present observation, that it is beyond the limits of the human mind.' I

own my ideas of philosophy are in this respect widely different from Mr

Godwin's. The only distinction that I see, between a philosophical

conjecture, and the assertions of the Prophet Mr Brothers, is, that one

is founded upon indications arising from the train of our present

observations, and the other has no foundation at all. I expect that

great discoveries are yet to take place in all the branches of human

science, particularly in physics; but the moment we leave past

experience as the foundation of our conjectures concerning the future,

and, still more, if our conjectures absolutely contradict past

experience, we are thrown upon a wide field of uncertainty, and any one

supposition is then just as good as another. If a person were to tell

me that men would ultimately have eyes and hands behind them as well as

before them, I should admit the usefulness of the addition, but should

give as a reason for my disbelief of it, that I saw no indications

whatever in the past from which I could infer the smallest probability

of such a change. If this be not allowed a valid objection, all

conjectures are alike, and all equally philosophical. I own it appears

to me that in the train of our present observations, there are no more

genuine indications that man will become immortal upon earth than that

he will have four eyes and four hands, or that trees will grow

horizontally instead of perpendicularly.

It will be said, perhaps, that many discoveries have already taken

place in the world that were totally unforeseen and unexpected. This I

grant to be true; but if a person had predicted these discoveries

without being guided by any analogies or indications from past facts,

he would deserve the name of seer or prophet, but not of philosopher.

The wonder that some of our modern discoveries would excite in the

savage inhabitants of Europe in the times of Theseus and Achilles,

proves but little. Persons almost entirely unacquainted with the powers

of a machine cannot be expected to guess at its effects. I am far from

saying, that we are at present by any means fully acquainted with the

powers of the human mind; but we certainly know more of this instrument

than was known four thousand years ago; and therefore, though not to be

called competent judges, we are certainly much better able than savages

to say what is, or is not, within its grasp. A watch would strike a

savage with as much surprise as a perpetual motion; yet one is to us a

most familiar piece of mechanism, and the other has constantly eluded

the efforts of the most acute intellects. In many instances we are now

able to perceive the causes, which prevent an unlimited improvement in

those inventions, which seemed to promise fairly for it at first. The

original improvers of telescopes would probably think, that as long as

the size of the specula and the length of the tubes could be increased,

the powers and advantages of the instrument would increase; but

experience has since taught us, that the smallness of the field, the

deficiency of light, and the circumstance of the atmosphere being

magnified, prevent the beneficial results that were to be expected from

telescopes of extraordinary size and power. In many parts of knowledge,

man has been almost constantly making some progress; in other parts,

his efforts have been invariably baffled. The savage would not probably

be able to guess at the causes of this mighty difference. Our further

experience has given us some little insight into these causes, and has

therefore enabled us better to judge, if not of what we are to expect

in future, at least of what we are not to expect, which, though

negative, is a very useful piece of information.

As the necessity of sleep seems rather to depend upon the body than the

mind, it does not appear how the improvement of the mind can tend very

greatly to supersede this 'conspicuous infirmity'. A man who by great

excitements on his mind is able to pass two or three nights without

sleep, proportionably exhausts the vigour of his body, and this

diminution of health and strength will soon disturb the operations of

his understanding, so that by these great efforts he appears to have

made no real progress whatever in superseding the necessity of this

species of rest.

There is certainly a sufficiently marked difference in the various

characters of which we have some knowledge, relative to the energies of

their minds, their benevolent pursuits, etc., to enable us to judge

whether the operations of intellect have any decided effect in

prolonging the duration of human life. It is certain that no decided

effect of this kind has yet been observed. Though no attention of any

kind has ever produced such an effect as could be construed into the

smallest semblance of an approach towards immortality, yet of the two,

a certain attention to the body seems to have more effect in this

respect than an attention to the mind. The man who takes his temperate

meals and his bodily exercise, with scrupulous regularity, will

generally be found more healthy than the man who, very deeply engaged

in intellectual pursuits, often forgets for a time these bodily

cravings. The citizen who has retired, and whose ideas, perhaps,

scarcely soar above or extend beyond his little garden, puddling all

the morning about his borders of box, will, perhaps, live as long as

the philosopher whose range of intellect is the most extensive, and

whose views are the clearest of any of his contemporaries. It has been

positively observed by those who have attended to the bills of

mortality that women live longer upon an average than men, and, though

I would not by any means say that their intellectual faculties are

inferior, yet, I think, it must be allowed that, from their different

education, there are not so many women as men, who are excited to

vigorous mental exertion.

As in these and similar instances, or to take a larger range, as in the

great diversity of characters that have existed during some thousand

years, no decided difference has been observed in the duration of human

life from the operation of intellect, the mortality of man on earth

seems to be as completely established, and exactly upon the same

grounds, as any one, the most constant, of the laws of nature. An

immediate act of power in the Creator of the Universe might, indeed,

change one or all of these laws, either suddenly or gradually, but

without some indications of such a change, and such indications do not

exist, it. Is just as unphilosophical to suppose that the life of man

may be prolonged beyond any assignable limits, as to suppose that the

attraction of the earth will gradually be changed into repulsion and

that stones will ultimately rise instead of fall or that the earth will

fly off at a certain period to some more genial and warmer sun.

The conclusion of this chapter presents us, undoubtedly, with a very

beautiful and desirable picture, but like some of the landscapes drawn

from fancy and not imagined with truth, it fails of that interest in

the heart which nature and probability can alone give.

I cannot quit this subject without taking notice of these conjectures

of Mr Godwin and Mr Condorcet concerning the indefinite prolongation of

human life, as a very curious instance of the longing of the soul after

immortality. Both these gentlemen have rejected the light of revelation

which absolutely promises eternal life in another state. They have also

rejected the light of natural religion, which to the ablest intellects

in all ages has indicated the future existence of the soul. Yet so

congenial is the idea of immortality to the mind of man that they

cannot consent entirely to throw it out of their systems. After all

their fastidious scepticisms concerning the only probable mode of

immortality, they introduce a species of immortality of their own, not

only completely contradictory to every law of philosophical

probability, but in itself in the highest degree narrow, partial, and

unjust. They suppose that all the great, virtuous, and exalted minds

that have ever existed or that may exist for some thousands, perhaps

millions of years, will be sunk in annihilation, and that only a few

beings, not greater in number than can exist at once upon the earth,

will be ultimately crowned with immortality. Had such a tenet been

advanced as a tenet of revelation I am very sure that all the enemies

of religion, and probably Mr Godwin and Mr Condorcet among the rest,

would have exhausted the whole force of their ridicule upon it, as the

most puerile, the most absurd, the poorest, the most pitiful, the most

iniquitously unjust, and, consequently, the most unworthy of the Deity

that the superstitious folly of man could invent.

What a strange and curious proof do these conjectures exhibit of the

inconsistency of scepticism! For it should be observed, that there is a

very striking and essential difference between believing an assertion

which absolutely contradicts the most uniform experience, and an

assertion which contradicts nothing, but is merely beyond the power of

our present observation and knowledge. So diversified are the natural

objects around us, so many instances of mighty power daily offer

themselves to our view, that we may fairly presume, that there are many

forms and operations of nature which we have not yet observed, or

which, perhaps, we are not capable of observing with our present

confined inlets of knowledge. The resurrection of a spiritual body from

a natural body does not appear in itself a more wonderful instance of

power than the germination of a blade of wheat from the grain, or of an

oak from an acorn. Could we conceive an intelligent being, so placed as

to be conversant only with inanimate or full grown objects, and never

to have witnessed the process of vegetation and growth; and were

another being to shew him two little pieces of matter, a grain of

wheat, and an acorn, to desire him to examine them, to analyse them if

he pleased, and endeavour to find out their properties and essences;

and then to tell him, that however trifling these little bits of matter

might appear to him, that they possessed such curious powers of

selection, combination, arrangement, and almost of creation, that upon

being put into the ground, they would choose, amongst all the dirt and

moisture that surrounded them, those parts which best suited their

purpose, that they would collect and arrange these parts with wonderful

taste, judgement, and execution, and would rise up into beautiful

forms, scarcely in any respect analogous to the little bits of matter

which were first placed in the earth. I feel very little doubt that the

imaginary being which I have supposed would hesitate more, would

require better authority, and stronger proofs, before he believed these

strange assertions, than if he had been told, that a being of mighty

power, who had been the cause of all that he saw around him, and of

that existence of which he himself was conscious, would, by a great act

of power upon the death and corruption of human creatures, raise up the

essence of thought in an incorporeal, or at least invisible form, to

give it a happier existence in another state.

The only difference, with regard to our own apprehensions, that is not

in favour of the latter assertion is that the first miracle we have

repeatedly seen, and the last miracle we have not seen. I admit the

full weight of this prodigious difference, but surely no man can

hesitate a moment in saying that, putting Revelation out of the

question, the resurrection of a spiritual body from a natural body,

which may be merely one among the many operations of nature which we

cannot see, is an event indefinitely more probable than the immortality

of man on earth, which is not only an event of which no symptoms or

indications have yet appeared, but is a positive contradiction to one

of the most constant of the laws of nature that has ever come within

the observation of man.

When we extend our view beyond this life, it is evident that we can

have no other guides than authority, or conjecture, and perhaps,

indeed, an obscure and undefined feeling. What I say here, therefore,

does not appear to me in any respect to contradict what I said before,

when I observed that it was unphilosophical to expect any specifick

event that was not indicated by some kind of analogy in the past. In

ranging beyond the bourne from which no traveller returns, we must

necessarily quit this rule; but with regard to events that may be

expected to happen on earth, we can seldom quit it consistently with

true philosophy. Analogy has, however, as I conceive, great latitude.

For instance, man has discovered many of the laws of nature: analogy

seems to indicate that he will discover many more; but no analogy seems

to indicate that he will discover a sixth sense, or a new species of

power in the human mind, entirely beyond the train of our present

observations.

The powers of selection, combination, and transmutation, which every

seed shews, are truly miraculous. Who can imagine that these wonderful

faculties are contained in these little bits of matter? To me it

appears much more philosophical to suppose that the mighty God of

nature is present in full energy in all these operations. To this all

powerful Being, it would be equally easy to raise an oak without an

acorn as with one. The preparatory process of putting seeds into the

ground is merely ordained for the use of man, as one among the various

other excitements necessary to awaken matter into mind. It is an idea

that will be found consistent, equally with the natural phenomena

around us, with the various events of human life, and with the

successive revelations of God to man, to suppose that the world is a

mighty process for the creation and formation of mind. Many vessels

will necessarily come out of this great furnace in wrong shapes. These

will be broken and thrown aside as useless; while those vessels whose

forms are full of truth, grace, and loveliness, will be wafted into

happier situations, nearer the presence of the mighty maker.

I ought perhaps again to make an apology to my readers for dwelling so

long upon a conjecture which many, I know, will think too absurd and

improbable to require the least discussion. But if it be as improbable

and as contrary to the genuine spirit of philosophy as I own I think it

is, why should it not be shewn to be so in a candid examination? A

conjecture, however improbable on the first view of it, advanced by

able and ingenious men, seems at least to deserve investigation. For my

own part I feel no disinclination whatever to give that degree of

credit to the opinion of the probable immortality of man on earth,

which the appearances that can be brought in support of it deserve.

Before we decide upon the utter improbability of such an event, it is

but fair impartially to examine these appearances; and from such an

examination I think we may conclude, that we have rather less reason

for supposing that the life of man may be indefinitely prolonged, than

that trees may be made to grow indefinitely high, or potatoes

indefinitely large. Though Mr Godwin advances the idea of the

indefinite prolongation of human life merely as a conjecture, yet as he

has produced some appearances, which in his conception favour the

supposition, he must certainly intend that these appearances should be

examined and this is all that I have meant to do.

An Essay on the Principle of Population · 第 12 / 19 章