The excerpts in this collection focus on systematic treatment. Among Greek texts are those from Origen, Didymus the Blind, Julian the Arian, John Chrysostom, Hesychius of Jerusalem and Olympiodorus. Among Latin sources we find Julian of Eclanum, Philip the Priest and Gregory the Great. Among Syriac sources we find Ephrem the Syrian and Isho'dad of Merv, some of whose work is made available here for the first time in English.