The desert father John Cassian is considered one of the most important spiritual teachers. Cassian's spirituality has significantly influenced Western spiritual life. His experiences and insights were pioneering for many founders of religious orders, including Benedict. This new translation of Cassian's Collationes 18 to 24 is an important source text, not only for religious communities but also for committed Christians and anyone seeking spirituality. The third and final part contains discussions 18 to 24, which address topics such as the meaning of fasting, dealing with thoughts and the past, as well as patience.