Origen

(tom. ii. in Joan. c. 19) But they ask, why is not the Word Itself called the light of men, instead of the life which is in the Word? We reply, that the life here spoken of is not that which rational and irrational animals have in common, but that which is annexed to the Word which is within us through participation of the primæval Word. For we must distinguish the external and false life, from the desirable and true. We are first made partakers of life: and this life with some is light potentially only, not in act; with those, viz. who are not eager to search out the things which appertain to knowledge: with others it is actual light, those who, as the Apostle saith, covet earnestly the best gifts, (1 Cor. 12:31) that is to say, the word of wisdom. (c. 14.). (Ifk the life and the light of men are the same, whoso is in darkness is proved not to live, and none who liveth abideth in darkness.)