Gregory the Dialogist

The prophet says, "The beasts of burden have become putrid in their own dung." For beasts of burden to become putrid in their own dung means for all those who are materialistic to end their lives in the stench of dissipation. As often as we prove a materialistic heart for its sins, as often as we draw back to its memory the wrongs it has committed, it is as if we are turning a measure of dung onto a barren tree. It is to call to mind the evils it has done and grow fertile to the gift of compunction as if from the stench.

40 Homilies on the Gospels, Homily X ↗