Justin Martyr on Reason

From the First Apology, 46:

Lest some should unreasonably object, in order to turn men away from what we teach, that we say that Christ was born a hundred and fifty years ago under Quirinius, and taught what we say he taught still later, under Pontius Pilate, and should accuse us [as supposing] that all men born before that time were irresponsible, I will solve this difficulty in advance. We have been taught that Christ is the First-begotten of God, and have previously testified that he is the Reason of which every race of man partakes. Those who lived in accordance with Reason are Christians, even though they were called godless, such as, among the Greeks, Socrates and Heraclitus and others like them; among the barbarians, Abraham, Ananiah, Azariah, and Mishael, and Elijah, and many others, whose deeds and names I forbear to list, knowing that this would be lengthy. So also those who lived without Reason were ungracious and enemies to Christ, and murderers of those who lived by Reason. But those who lived by Reason, and those who so live now, are Christians, fearless and unperturbed.