Self-mortification is a form of PENANCE, which is an act of self-punishment or self-denial as a way of expressing remorse for a wrong committed. It is often used in religious contexts as a way to atone for sins and transgressions. Self-mortification can take many forms, such as fasting, abstaining from certain activities, or engaging in physical pain or discomfort. It is a way of showing humility and repentance, and is seen as a way to draw closer to God.