Ambrose of Milan

And first of all, let us understand that the structure of the human body is like that of the world. Just as the sky towers over the air, the earth, and the sea, which are like certain members of the world, so too we see that the head stands out above the other parts of our body and is the most excellent of all, like the sky among the elements, like a citadel among the other fortifications of a city. …

The Six Days of Creation ↗

Jerome

"The wise man has his eyes in his head, whereas a fool walks in darkness. But I also realised that the same fate awaits them all. "Whoever attains complete wisdom and has deserved Christ to be his aim always raises his eyes to the heavens and will therefore never think about terrestrial matters. When these things are considered in this way and there is such a distinction between a wise man and a fool, one being compared with day and the other with darkness, the former raises his eyes to heaven, the latter looks on the ground. …

Commentary on Ecclesiastes ↗

Bonaventure

"The eyes of the wise man are in his head," namely for directing: "the fool walks in darkness," as though he had no eyes in his head. That wisdom indeed illuminates, Wisdom 6: "Love the light of wisdom, all you who rule over peoples"; whence also Christ, the wisdom of God, calls himself light; John 8: "I am the light of the world." On the contrary, folly is darkness: Isaiah 5: "Woe to you who call good evil and evil good, who put darkness for light and light for darkness"; whence John 1: "The light shines in the darkness, and the …

Commentary on Ecclesiastes, Chapter 2 ↗