A religious Brother is a member of a Christian religious institute or religious order who commits himself to following Christ in consecrated life of the Church, usually by the vows of poverty, chastity and obedience. He is a layman, in the sense of not being ordained as a deacon or priest, and usually lives in a religious community and works in a ministry appropriate to his capabilities. A brother might practice any secular occupation. The term "brother" is used as he is expected to be as a brother to others. Brothers are members of a variety of religious communities, which may be contemplative, monastic, or apostolic in character. Some religious institutes are composed only of brothers; others are so-called "mixed" communities that are made up of brothers and clerics (priests or ministers, and seminarians).
It is also common in many Christian groups to refer to other members as "brother" or "sister". In particular, the Christian Shakers use the title for all male adult members.
As monasticism developed in the early days of Christianity, most monks remained laymen, as ordination to ministry was seen as a hindrance to the monks' vocation to a contemplative life. Guided by the Rule of St. Benedict, the main lifestyle they followed was either agricultural or that of a desert hermit. Various forces and trends through the Middle Ages led to the situation where monks were no longer following this manner of living. Instead, they were focusing primarily on the religious obligations of intercessory prayer, especially for donors to the monasteries. This was encouraged by a spiritual reliance among the general membership of the Catholic Church upon the prayers of monastics to achieve salvation.