Irenaeus exercised wide influence on the generation which followed. Both Hippolytus and Tertullian freely drew on his writings. However, none of his works aside from "Against Heresies" and "The Demonstration of the Apostolic Preaching" survive today, perhaps because his literal hope of an earthly millennium may have made him uncongenial reading in the Greek East. Even though no complete version of "Against Heresies" in its original Greek exists, we possess the full ancient Latin version, probably of the third century, as well as thirty-three fragments of a Syrian version and a complete Armenian version of books 4 and 5.