St. Nicholas Cabasilas 1323-1391
Why is it that for the consecration of the Offerings the Celebrant does not invoke the Son, Who is the Priest and Sanctifier, as we have said, but rather the Father?
It is to teach us that the Savior possess this power of sanctification not in His quality as a man, but because He is God, and because of the Divine power which He shares with His Father. This is what our Lord Himself wished to show us when, while instituting the Sacrament, He lifted His eyes up to heaven and offered the Bread to His Father. For the same reason, He performed many of His miracles in an attitude of prayer to God; He wished to show that this was not the work of His human nature, according to which He had a mother on earth, but of His Divinity, according to which God was His Father. In the same way, when He was about to ascend the Cross, wishing to show that He had two wills, the Divine and the Human, He attributed to His Father His divine will, keeping to Himself His human one. “Not as I will but as Thou will but as Thou wilt”, and again: “Not my will but Thine be done.” Yet the very words in which He seems to separate His own will from that of His Father show that He Himself willed that will of the Father which He fulfilled. For the phrase “Not my will but Thine be done” implies agreement and a unity of wills. He demonstrates this also when He reproaches Peter for shrinking from the idea of His Cross and death and again when He says: “I have greatly longed to eat this Passover with you before I suffer.” I have desired this Passover before My Passion, he says — as if to say: I have desired to reach the threshold of that Passion. (A Commentary on the Divine Liturgy, 31.)