Ambrose of Milan, on Ps 102:5

“Who satisfieth thy desire with good things: thy youth shall be renewed like the eagle’s.”

“However, rightly so, a man has not many, but two feet; for four feet belong to wild animals and beasts, and two to birds. Therefore, a man is like a bird, who seeks lofty things with his sight and flies with a certain stroke of the senses' keenness. And therefore it is said about him: Your youth will be renewed like the eagle's; because he is closer to heavenly things and higher than eagles, who can say: But our conversation is in heaven.”

Imported from an open dataset — not yet checked against the printed edition.