Chapter 26 — Part III — The Ten Commandments
Section 513. Q. What is it to deny one's self? A. Basil the Great explains it thus: He denies himself who puts off the old man with his deeds, which is corrupt, according to the deceitful lusts; who renounces also all worldly affections, which can hinder his intention of godliness. Perfect self-denial consists in this, that he cease to have any affection even for life itself, and bear the judgment of death in himself, that he may not trust in himself. (Can. Long. Resp. 8.)