The Replies to the True Believers on Certain Necessary Questions, Greek Questions to the Christians about Unembodiment, God and the Resurrection of the Dead (with the Christian answers), The Christian Questions to the Greeks (with the Greek answere, and the Refutation of Incorrect Answers) and the Confutation of Certain Teachings of Aristotle are the Christian side of the philosophical debate between Christians and pagans. They have come down to us among the works of Justin, but cannot be his; Prof. Harnack gives reasons to assign them to the strpngly anti-Eutychian bishop Diodorus of Tarsus.