On Unbridled Affections

When a man desires a thing too much, he becomes ill at ease... is quickly tempted and overcome by small, trifle evils. He is sad to forego them; quick to anger if reproved. Yet if he satisfies his desires, remorse of conscience overwhelms him because he followed his passions and they did not lead him to the peace he sought.

True peace of heart then is found in resisting passions, not in satisfying them.