Psalms 110:7

Hence it is also well said through the Psalmist: "He shall drink of the torrent in the way, therefore shall He lift up His head." For indeed from the very beginning of the world a torrent of death had flowed forth in the human race: but the Lord drank of this torrent in the way, because He tasted death in passing. And therefore He lifted up His head, because what He laid in the tomb by dying, He raised above the angels by rising again; and from that point He struck down the ancient enemy forever, from the very place where He temporarily permitted the hands of persecutors to rage against Him.

"He shall drink of the brook in the way, therefore shall he lift up his head" [Psalm 110:7]. Let us consider Him drinking of the brook in the way: first of all, what is the brook? the onward flow of human mortality: for as a brook is gathered together by the rain, overflows, roars, runs, and by running runs down, that is, finishes its course; so is all this course of mortality. Men are born, they live, they die, and when some die others are born, and when they die others are born, they succeed, they flock together, they depart and will not remain. What is held fast here? what doth not run? what is not on its way to the abyss as if it was gathered together from rain? For as a river suddenly drawn together from rain from the drops of showers runneth into the sea, and is seen no more, nor was it seen before it was collected from the rain; so this hidden rain is collected together from hidden sources, and floweth on; at death again it travelleth where it is hidden: this intermediate state soundeth and passeth away. Of this brook He drinketh, He hath not disdained to drink of this brook; for to drink of this brook was to Him to be born and to die. What this brook hath, is birth and death; Christ assumed this, He was born, He died. "Therefore hath He lifted up His head;" that is, because He was humble, and "became obedient unto death, even the death of the Cross: therefore God also hath highly exalted Him, and given Him a Name which is above every name; that at the Name of Jesus every knee shall bow, of things in Heaven, and things in earth, and things under the earth; and that every tongue shall confess that Jesus Christ the Lord is in the glory of God the Father." [Philippians 2:8-11]

Therefore, beloved, He rejoiced as a giant to run His course. What course, if not the mortal path which He deemed worthy to share with us? That is the path through which humankind passes. For they pass through it by being born and by dying. And this river of the human race flows perpetually from the hidden veins of nature from the beginning to the end. From this rapid and turbulent river Christ deigned to drink. You have just heard in the psalm: "He drinks from the torrent in the way." This torrent led us to birth, and led us to death. As from a hidden spring, Christ received the abyss of the sea. For us, He was both born and died. And because men, positioned in the middle of this river, often delight in the flatteries and allurements of the world, which are involved in the silt of this torrent, and they are submerged into the depths of hell, who, eagerly drinking the passing waves, are thus killed by trying to stand in the precipitous torrent and seeking firm steps in its republic: thus the Lord drank from the torrent in the way. What does it mean, "He drank in the way"? He drank while passing through. For He drank and passed through, He did not remain: nor did He stand in the way of sinners. Again, men fear death; because it is necessary for all to be hurled by the force of this torrent: but Christ could not fear the death He voluntarily accepted; thus it is said: "And He rejoiced as a giant to run His course." For He descended and ran: ascended and sat. ...If we ask why all these things were done, dearest ones, we will find they were done for us. For He descended, so that we might ascend; died, so that we might live; rose again, so that we might rise again; ascended into heaven, so that we might learn to despise worldly things and to lift our hearts upward. Finally, to raise our hope after Him, He first raised His flesh: and so that we might hope this would follow in us, what He received from us preceded in Him.