In him was life; and the life was the light of men.
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Theophilus of Antioch
AD 184
He had said, In him was life, that you might not suppose that the Word was without life. Now he shows that that life is spiritual, and the light of all reasonable creatures. And the life was the light of men: i.e. not sensible, but intellectual light, illuminating the very soul.
He said not, the Light of the Jews only, but of all men: for all of us, in so far as we have received intellect and reason, from that Word which created us, are said to be illuminated by Him. For the reason which is given to us, and which constitutes us the reasonable beings we are, is a light directing us what to do, and what not to do.