Origen

“ Walking in darkness signifies evil conduct, and to hate one’s brother, is not that to fall away from that which is properly called knowledge? But he also who is ignorant of divine things walks in darkness, just because of that ignorance ”

“ We are still enquiring about the light of men, since it is what was spoken of in the preceding verse, and also, I consider, about darkness, which is named as its adversary, the darkness also being, if the definition of it is correct, that of men. The light of men is a generic notion covering two special things; and with the darkness of men it is the same. He who has gained the light of men and shares its beams will do the work of light and know in the higher sense, being illuminated by the light of the higher knowledge. ”