[79] As, therefore, the sun extends his rays from heaven to the boundaries of the earth, tempering and dissolving the exceeding violence of the heat that is in them by cool air, for he mixes his rays with that, in order that that portion of them which gives light being separated from that portion which gives heat, he may remit somewhat of his power of burning, [33] [34] but retain the power by which he gives light, and so be received with welcome, when meeting that kindred and friendly light which is situated in the eyes of man; for the meeting of these two lights in the same place, coming from an opposite direction, and the reception of the one by the other, is what causes that comprehension which we arrive at by our faculty of sight: but what mortal could possibly receive in this manner the knowledge, and wisdom, and prudence, and justice, and all the other virtues of God, in an unalloyed state? The whole heaven, the whole world, could not do so.