Fraternity, service and contemplation are essential values for all Carmelites. The hermits were forced to leave their home on Mount Carmel and settle in Europe. There they changed their style of life from hermits to friars. The major difference is that friars are called to serve the People of God in some active apostolate. Some congregations were founded for a specific work, but the Carmelite Order tries to respond to what it sees as the needs of the Church and the world which differ according to time and place, and so many friars work in parishes, schools, universities, retreat centres, prisons and hospitals. The kind of service in which each individual friar is involved will depend on the perceived needs of the people in whose midst he lives and his own particular talents.