In Christianity, the three evangelical counsels, or counsels of perfection, are chastity, poverty, and obedience. As stated by Jesus in the canonical gospels, they are counsels for those who desire to become "perfect". The Catholic Church interprets this to mean that they are not binding upon all, and hence not necessary conditions to attain eternal life (heaven), but that they are "acts of supererogation" exceeding the minimum stipulated in the biblical commandments. Catholics who have made a public profession to order their lives by the evangelical counsels, and confirmed this by public vows before their competent church authority, are recognised as members of the consecrated life.

Christian monasticism is the devotional practice of Christians who live ascetic and typically cloistered lives that are dedicated to Christian worship. It began to develop early in the history of the Christian Church, modeled upon scriptural examples and ideals, including those in the Old Testament. It has come to be regulated by religious rules and, in modern times, the Canon law of the respective Christian denominations that have forms of monastic living. Those living the monastic life are known by the generic terms monks (men) and nuns (women). The word monk originated from the Greek μοναχός, itself from μόνος meaning 'alone'.