Tertullian Against Marcion Book V But how shall it be changed, if it shall have no real existence? If, however, this is only said of those who shall be found in the flesh[929] Tertullian On the Resurrection of the Flesh For when he adds, "This corruptible must put on incorruption, and this mortal must put on immortality,"[275] Origen Against Celsus Book V ere will remain at the time of the visitation which is to come upon the world by the fire of purification, not only those who are then alive, but also those who are long ago dead; "not observing that it is with a secret kind of wisdom that it was said by the apostle of Jesus: "We shall not all sleep, but we shall all be changed, in a moment, in the twinkling of an eye, at the last trump; for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed."[69] Then, knowing that there was a secret and mystical meaning in the passage, as was becoming in one who was leaving, in his Epistles, to those who were to come after him words full of significance, he subjoins the following, "Behold, I show you a mystery; "[79]