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, but not mandated as an institution in the scriptures. It has come to be regulated by religious rules (e. g. the Rule of Saint Augustine, Anthony the Great, St Pachomius, the Rule of St Basil, the Rule of St Benedict,) 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 (, 'monk'), itself from () meaning 'alone'. Christian monks did not live in monasteries at first, rather, they began by living alone as solitaries, as the word might suggest. As more people took on the lives of monks, living alone in the wilderness, they started to come together and model themselves after the original monks nearby. Quickly, the monks formed communities to further their ability to observe an ascetic life. According to Christianity historian Robert Louis Wilken, "By creating an alternate social structure within the Church they laid the foundations for one of the most enduring Christian institutions..." Monastics generally dwell in a monastery, whether they live there in a community (cenobites), or in seclusion (recluses). Life for monks and nuns The basic idea of monasticism in all its varieties is seclusion or withdrawal from the world or society. Monastic life is distinct from the "religious orders" such as the friars, canons regular, clerks regular, and the more recent religious congregations. The latter has essentially some special work or aim, such as preaching, teaching, liberating captives, etc., which occupies a large place in their activities. While monks have undertaken labors of the most varied character, in every case this work is extrinsic to the essence of the monastic state. Monks and friars are two distinct roles. In the thirteenth century "...new orders of friars were founded to teach the Christian faith," because monasteries had declined. Both ways of living out the Christian life are regulated by the respective church law of those Christian denominations that recognize it (e.g., the Roman Catholic Church, the Eastern Orthodox Church, the Anglican Church, or the Lutheran Church). Christian