"He dwells either in this world or in the resurrection or in the middle place. God forbid that I be found there! In this world there is good and evil. Its good things are not good, and its evil things not evil. But there is evil after this world which is truly evil, what is called 'the middle'. It is death. While we are in this world it is fitting for us to acquire the resurrection, so that when we strip off the flesh we may be found in rest and not walk in the middle. For many go astray on the way. For it is good to come forth from the world before one has sinned."
Gos. Phil. 66.8-24 (sec. century Valentinian text)