18 “For of the Lord is our taking up”. For I was moved like a heap of sand, that I might fall; and I should have fallen, had not the Lord taken me up. “For of the Lord is (our) taking up: and of the Holy One of Israel our King.” Himself is your taking up, Himself your illumination: in His light you are safe, in His light you walk, in His righteousness you are exalted. He took you up, He guards your weakness: He gives you strength of Himself, not of yourself.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)