“BUT WHEN JESUS had finished His course of patient endurance, and had redeemed mankind from their sins, He ascended again into the heavens, a cloud receiving Him up: and as He went up Angels were beside Him, and Apostles were beholding. But if any man disbelieves the words which I speak, let him believe the actual power of the things now seen. All kings when they die have their power extinguished with their life: but Christ crucified is worshipped by the whole world. We proclaim The Crucified, and the devils tremble now. Many have been crucified at various times; but of what other who was crucified did the invocation ever drive the devils away?
"Let us, therefore, not be ashamed of the Cross of Christ; but though another hide it, do thou openly seal it upon your forehead, that the devils may behold the royal sign and flee trembling far away. Make then this sign at eating and drinking, at sitting, at lying down, at rising up, at speaking, at walking: in a word, at every act. For He who was here crucified is in heaven above. If after being crucified and buried He had remained in the tomb, we should have had cause to be ashamed; but, in fact, He who was crucified on Golgotha here, has ascended into heaven from the Mount of Olives on the East. For after having gone down hence into Hades, and come up again to us, He ascended again from us into heaven, His Father addressing Him, and saying, Sit on My right hand, until I make Your enemies Your footstool."
~St. Cyril of Jerusalem: Catechetical Discourses, 4:13-14.
Altar Cross, by Gian Lorenzo. Gilt bronze corpus on bronze cross,
1657-61; Treasury of San Pietro, Vatican.
■ Feast of the Exaltation of the Cross, by Pope Benedict XVI
■ The True Cross, Catholic Encyclopedia