“Now it came to pass, while He blessed them, that He was parted from them and carried up into heaven.† And they worshiped Him, and returned to Jerusalem with great joy,”
…….on the fortieth day after the Resurrection in the presence of the disciples, was raised into heaven, and terminated His presence with us in the body, to abide on the Father’s right hand until the times Divinely fore-ordained for multiplying the sons of the Church are accomplished, and He comes to judge the living and the dead in the same flesh in which He ascended. And so that which till then was visible of our Redeemer was changed into a sacramental presence, and that faith might be more excellent and stronger, sight gave way to doctrine, the authority of which was to be accepted by believing hearts enlightened with rays from above.
Leo the Great, Sermon on the Ascension, Sermon 74, paragraph 2. NPNF2, Vol. 12.