Against the Epistle of Manichaeus Called Fundamental

⁴⁶ But if any one does not believe that corruption comes from nothing, let him place before himself existence and non-existence— one, as it were, on one side, and the other on the other (to speak so as not to outstrip the slow to understand); then let him set something, say the body of an animal, between them, and let him ask himself whether, while the body is being formed and produced, while its size is increasing, while it gains nourishment, health, strength, beauty, stability, it is tending, as regards its duration and permanence, to this side or that, to existence or non-existence.

He will see without difficulty, that even in the rudimentary form there is an existence, and that the more the body is established and built up in form, and figure and strength, the more does it come to exist, and to tend to the side of existence. Then, again, let the body begin to be corrupted; let its whole condition be enfeebled, let its vigor languish, its strength decay, its beauty be defaced, its framework be sundered, the consistency of its parts give way and go to pieces; and let him ask now where the body is tending in this corruption, whether to existence or non-existence: he will not surely be so blind or stupid as to doubt how to answer himself, or as not to see that, in proportion as anything is corrupted, in that proportion it approaches decease.

But whatever tends to decease tends to non-existence. Since, then, we must believe that God exists immutably and incorruptibly, while what is called nothing is clearly altogether nonexistent; and since, after setting before yourself existence and non-existence, you have observed that the more a visible object increases the more it tends towards existence, while the more it is corrupted the more it tends towards non-existence, why are you at a loss to tell regarding any nature what in it is from God, and what from nothing; seeing that visible form is natural, and corruption against nature?

The increase of form leads to existence, and we acknowledge God as supreme existence; the increase of corruption leads to non-existence, and we know that what is non-existent is nothing. Why then, I say, are you at a loss to tell regarding a corruptible nature, when you have both the words nature and corruptible, what is from God, and what from nothing? And why do you inquire for a nature contrary to God, since, if you confess that He is the supreme existence, it follows that non-existence is contrary to Him?