Proverbs 14:14 - Matthew Poole's English Annotations on the Holy Bible

The backslider in heart; he who departeth from God and from the way of his precepts with all his heart, which implies the doing it upon deliberation, with free choice, and full purpose, and customary practice, as ungodly men commonly do, and is opposed to the slips of human frailty; for otherwise every sin is a revolt from God. With his own ways; with the fruit of his ways or doings, the punishment of his sins. From himself, i.e. from his ways, as appears by the opposition; from the pious temper of his own heart, which cleaveth to the Lord, when the hearts of sinners forsake him; and from the holy and righteous course of his life, from which he shall receive unspeakable comfort and satisfaction both here and hereafter to all eternity.