Mortification in Catholic theology

The Roman Catholic Church has often held mortification of the flesh (literally, "putting the flesh to death"), as a worthy spiritual discipline. The practice is rooted in the Bible: in the asceticism of the Old and New Testament saints, and in its theology, such as the remark by Saint Paul, in his Epistle to the Romans, where he states: "If you live a life of nature, you are marked out for death; if you mortify the ways of nature through the power of the Spirit, you will have life." (Romans 8:13, DRC).

Source: Wikipedia — Mortification in Catholic theology (CC BY-SA 4.0)