On the Life of the Wise Man made perfect by Instruction or, on the Unwritten Law, that is to say, on Abraham (161-165)

But the eyes in a single moment can reach from earth to heaven, and taking in the extremest boundaries of the universe, reaching at the same moment to the east and to the west, and to the north and to the south, so as to survey them all at once, drag the mind towards what is visible.

And the mind, at once receiving a similar impression, does not continue quiet, but being in perpetual motion, and never slumbering, receiving from the sight the power of observing the objects appreciable by the intellect, comes to consider whether these things which are brought visibly before it are uncreated, or whether they have derived their origin from creation; also, whether they are bounded or infinite. Again, whether there are many worlds or only

Again, by these means it considers if the world has been created, by whom it has been created, and who the creator is as to his essence or quality, and with what design he made it, and what he is doing now, and what his mode of existence or cause of life is; and all other such questions as the excellently-endowed mind when cohabiting with wisdom is accustomed to examine.

These, and similar subjects, belong to philosophers, from which it is plain that wisdom and philosophy have not derived their origin from anything else that exists in us except from that queen of the outward senses, the sight, which God saved alone of the region of the body when he destroyed the other four, because these last were slaves to the flesh and to the passions of the flesh; but the sight alone was able to raise its head and to look up, and to find other sources of delight far superior to those proceeding from the bodily pleasures, those, namely, that are derived from the contemplation of the world and the things in it.

Therefore it was appropriate for one of the five outward senses, namely, the sight, like one city in the Pentapolis, to receive an especial reward and honour, and to remain while the others were destroyed, because it is not only conversant with mortal objects as they are, but is able also to forsake such, and to depart to the imperishable natures, and to rejoice in the sight of them.