The most interesting part of the presentation (for me, at least) came during the Q&A afterwards. A question was raised about the allegorical interpretations of Origen, the famous third century biblical scholar. In the course of his answer, Msgr. Tauer explained that Origen interpretated Psalm 24:7-10 as referring to the Ascension of Christ in the following manner.
When Christ ascended from the earth 40 days after His Resurrection, He was accompanied by all the angels who had ministered to Him while He was on earth. As they reached the heavenly city, however, the gates were closed, and therefore the angels with Christ called out, "Lift up your heads, O gates! and be lifted up, O ancient doors! that the King of glory may come in." The angels guarding the gates, however, called back, "Who is the King of glory?" To which the angels with Christ reply, "The LORD, strong and mighty, the LORD, mighty in battle! Lift up your heads, O gates! and be lifted up, O ancient doors! that the King of glory may come in." The angels inside, though, ask again: "Who is this King of glory?" To which the answer comes, "The LORD of hosts, he is the King of glory!"
Lord of hosts, of course, is a frequent title for God himself in the Old Testament, so here finally the angels inside throw open the doors of heaven to receive Christ returning in triumph. Apparently Origen poses the question that must occur to all who read his interpretation: Why did the angels not recognize Christ as God? His answer: never before had heaven known flesh. Interestingly enough, Handel chose this passage of Psalm 24 in connection with the Ascension of Christ in his musical masterpiece.