Pseudo-Tertullian Against All Heresies For they affirm that without those letters truth cannot be found; nay more, that in those letters the whole plenitude and perfection of truth is comprised; for this was why Christ said, "I am the Alpha and the Omega."[64] Cyprian Treatise XII Three Books of Testimonies Against the Jews Also in the same place: "I am Alpha and Omega, the first and the last, the beginning and the end. Blessed are they that do His commandments, that they may have power over the tree of life."[274]