Hence they at once fell into the absurdities which necessarily followed such a sentiment. But if there is a God who is incorporeal, invisible, and eternal, therefore it is credible that the soul, since it is not seen, does not perish after its departure from the body; for it is manifest that something exists which perceives and is vigorous, and yet does not come into sight. But, it is said, it is difficult to comprehend with the mind how the soul can retain its perception without those parts of the body in which the office of perception is contained. What about God? Is it easy to comprehend how He is vigorous without a body? But if they believe in the existence of gods who, if they exist, are plainly destitute of bodies, it must be that human souls exist in the same way, since it is perceived from reason itself, and discernment, that there is a certain resemblance in man and God. Finally, that proof which even Marcus Tullius saw is of sufficient strength: that the immortality of the soul may be discerned from the fact that there is no other animal which has any knowledge of God; and religion is almost the only thing which distinguishes man from the dumb creation. And since this falls to man alone, it assuredly testifies that we may aim at, desire, and cultivate that which is about to be familiar and very near.