Gregory the Great

(Mor. xix. 1.) Otherwise; The fox is a crafty animal, lying hid in ditches and dens, and when it comes abroad never going in a straight path, but in crooked windings; birds raise themselves in the air. By the foxes then are meant the subtle and deceitful dæmons, by the birds the proud dæmons; as though He had said; Deceitful and proud dæmons have their abode in your heart; but my lowliness finds no rest in a proud spirit.