Men of Galilee
When they had gathered together they asked him, “Lord, are you at this time going to restore the kingdom to Israel?”
He answered them, “It is not for you to know the times or seasons that the Father has established by his own authority. But you will receive power when the Holy Spirit comes upon you, and you will be my witnesses in Jerusalem, throughout Judea and Samaria, and to the ends of the earth.”
When he had said this, as they were looking on, he was lifted up, and a cloud took him from their sight.
While they were looking intently at the sky as he was going, suddenly two men dressed in white garments stood beside them. They said, “Men of Galilee, why are you standing there looking at the sky? This Jesus who has been taken up from you into heaven will return in the same way as you have seen him going into heaven.”
Then they returned to Jerusalem from the mount called Olivet, which is near Jerusalem, a sabbath day’s journey away.
(Acts 1:6-12)
Christ’s Ascension is therefore not a spectacle for the disciples but an event into which they themselves are included. It is a sursum corda, a movement toward the above into which we are all called. It tells us that man can live toward the above, that he is capable of attaining heights.
More: the altitude that alone is suited to the dimensions of being human is the altitude of God himself. Man can live at this height, and only from this height do we properly understand him. The image of man has been raised up, but we have the freedom to tear it down or to let ourselves be raised.
(Joseph Cardinal Ratzinger)