The great Christian duty is self-denial, which consists in two things: first, in denying worldly inclinations and its enjoyments, and second, in denying self-exultation and renouncing one’s self-significance by being empty of self.
Jonathan Edwards
If you are to be self-controlled in your speech you must be self-controlled in your thinking.
François Fénelon
In the final analysis, every sin results from preoccupation with self. We sin because we are totally selfish, totally devoted to ourselves, rather than to God and to others.