Gregory the Dialogist

For he hath put his own foot into the net, and he walketh in the meshes of it. He, who 'puts his feet into a net,' cannot get them out, when he has a mind; so he that lets himself down, into habits of sin, cannot rise up the moment he wishes it; and he 'that walketh in the meshes of a net,' entangles his steps in walking, and when he tries to extricate himself to walk, he is tied and bound that he cannot. …

Morals on the Book of Job, Book XIV ↗

Thomas Aquinas

He says that the cause of these impediments comes from his sin, "For he put his feet in the snare." For just as one who willingly puts his foot in a snare wants to be captured, so one who willingly occupies himself with sin disposes himself to have his progress impeded as Scripture says, "His own iniquities have ensnared the evil man." (Prov. 5:22) As there are a variety of meshes in a net, so also in sin there are many different sins which entangle a man in various ways. …

Commentary on Job ↗