26. The Scholastics have argued much pro and con with their numerous subtleties, to make this doctrine comprehensible. But if you do not wish to become entangled in the meshes of the enemy, ignore their cunning, arrogance, and subtleties, and hold to these divine words. Press into them and remain in them, like a hare in a rocky crevice. If you come out and deign to listen to human talk, the enemy will lead you on and overcome you, so that you will at last not know where reason, faith, God, or even yourself are.
27. Believe me, as one who has experienced and tried it, and who does not talk into an empty barrel; the Scriptures are not given us for naught. If reason could have kept on the right road, the Scriptures would not have been given us.
So it is also here. Although all men are not illumined, nevertheless this is the only light through which all illumination comes. The Evangelist has used this manner of speech freely, and had no fear that some might take offense because he says “all men.” He thought he would anticipate all such offense, and explains himself before and afterwards, and says: “The darkness apprehended him not, and his own received him not.” These words are sufficient proof to prevent anyone from saying that the Evangelist meant to say that all men are illumined; but he did wish to say that Christ is the only Light that lighteth all men, and without him no man is lighted.
St. John the Evangelist
Sunday after Christmas, from paragraph 51