What is the exact line of demarcation between man and the other animals
which he calls brutes? In what way does he essentially differ from the
beasts? It is, we are told, by his intelligence, by the faculties of his
mind, by his reason, that man is superior to all the other animals,
which in all they do, act but by physical impulsions, reason taking no
part. But the beasts, having more limited needs than men, do very well
without these intellectual faculties, which would be perfectly useless
in their way of living. Their instinct is sufficient for them, while all
the faculties of man are hardly sufficient to render his existence
endurable, and to satisfy the needs which his imagination, his
prejudices, and his institutions multiply to his torment.
The brute is not affected by the same objects as man; it has neither the
same needs, nor the same desires, nor the same whims; it early reaches
maturity, while nothing is more rare than to see the human being
enjoying all of his faculties, exercising them freely, and making a
proper use of them for his own happiness.