LIGHT EXISTS SIMULTANEOUSLY WITHIN AND WITHOUT.

7. Imagine a luminous point which serves as centre, and imagine around

it a transparent sphere, so that the clearness of the luminous point

shines in the whole body that surrounds it without the exterior

receiving any light from elsewhere; you will surely have to acknowledge

that this interior light, by remaining impassible, penetrates the

whole surrounding mass, and that it embraces the whole sphere from

the central point in which it is seen to shine. The truth is that the

light did not emanate from the little body placed in the centre; for

this little body did not glow inasmuch as it was a body, but inasmuch

as it was a luminous body; that means, by virtue of an incorporeal

power. Now in thought annihilate the mass of the little luminous body,

and preserve its luminous power; could you still say that light is

somewhere? Will it not be equally in the interior, and in the whole

exterior sphere? You will no longer perceive where it was fixed before,

and you will no longer say whence it comes, nor where it is; in this

respect you will remain uncertain and astonished; you will see the

light shine simultaneously in the interior and in the exterior sphere.

An example of this is the solar light that shines in the air when

you look at the body of the sun, at the same time that you perceive

everywhere the same light without any division; that is demonstrated

by objects that intercept the light; they reflect it nowhere else

than in the direction from which it came; they do not shatter it into

fragments. But if the sun were an incorporeal power, you could not,

when it would radiate light, tell where the light began, nor from where

it was sent; there would be but a single light, the same everywhere,

having neither point of beginning, nor principle from which it proceeds.

Plotinos: Complete Works, v. 2 In Chronological Order, Grouped in Four Periods · 第 15 / 381 题