Theophilus to Autolycus

But some one will say to us, Was man made by nature mortal? Certainly not. Was he, then, immortal? Neither do we affirm this. But one will say, Was he, then, nothing? Not even this hits the mark. He was by nature neither mortal nor immortal. For if He had made him immortal from the beginning, He would have made him God. Again, if He had made him mortal, God would seem to be the cause of his death. Neither, then, immortal nor yet mortal did He make him, but, as we have said above, capable of both; so that if he should incline to the things of immortality, keeping the commandment of God, he should receive as reward from Him immortality, and should become God; but if, on the other hand, he should turn to the things of death, disobeying God, he should himself be the cause of death to himself.

For God made man free, and with power over himself. That, then, which man brought upon himself through carelessness and disobedience, this God now vouchsafes to him as a gift through His own philanthropy and pity, when men obey Him. For as man, disobeying, drew death upon himself; so, obeying the will of God, he who desires is able to procure for himself life everlasting. For God has given us a law and holy commandments; and every one who keeps these can be saved, and, obtaining the resurrection, can inherit incorruption.