The concept of a “retreat” has a long and varied history. In the Christian context the invitation of Jesus to “come away and rest awhile” (Mark 6.31) is often thought of as the first invitation to “make retreat.” The original inspiration for “retreat” can be traced to the notion of a “retreat of the whole Church” in the forty-day season of Lent as codified after the Council of Nicaea (325) and to the development of monasticism as a form of collective retreat.