In 1264, Pope Urban IV called upon St. Thomas Aquinas to compose the prayers and hymns for this new celebration. The hymns Aquinas wrote - including Pange Lingua (with Tantum Ergo) and Panis Angelicus - are still treasured and sung throughout the Church today.
Fr. Greg connects the mountain of the Ascension in Galilee back to the mountain of the Transfiguration, where Jesus was first revealed in radiant light. Today, that same light is entrusted to us.