Evagrius of Pontus (c.345-399) was one of the most prominent figures among the monks of the desert settlements of Nitria, Sketis, and Kellia in Lower Egypt. Through the course of his ascetic writings he formulated a systematic presentation of the teaching of the semi-eremitic monks of these settlements. The works of Evagrius had a profound influence on Eastern Orthodox monastic teaching and passed to the West through the writings of John Cassian (c.365-435). This is the first complete English translation of Evagrius' Greek ascetic writings, based on modern critical editions, where available, and, where they are not, on collations of the principal manuscripts. Two appendices provide variant readings for the Greek texts and the complete text of the long recension of Eulogios. The translations are accompanied by a commentary to guide the reader through the intricacies of Evagrian thought by offering explanatory comments and references to other Evagrian texts and relevant scholarly literature. Finally, detailed indexes are provided to allow the reader to identify and study the numerous themes of Evagrian teaching.