St. Francis called the birds his brothers. Perfectly sure that he himself was a spiritual being, he thought it at least possible that the birds might be spiritual beings likewise, incarnate like himself in mortal flesh, and saw no degradation to the dignity of human nature in claiming kindred lovingly with creatures so beautiful, so wonderful, who (as he fancied in his old-fashioned way) praised God in the forest even as angels did in heaven.

Prose Idylls. 1867.