The majority of Evagrius's extant letters survive in a corpus of 62 letters of various lengths, all providing spiritual counsel to various figures such as Rufinus, St. Melania the Elder, St. Gregory Nazianzus, Bp. John of Jerusalem. The letters, which feature a considerable amount of material that he used in other works, survive entirely in Syriac, and only fragmentarily in Greek. For letters not included in this corpus, see CPG 2438, 2439; cover letters to other treatises, e.g., CPG 2430, 2434.