14 For if there be error in you, You will not worship a strange god. If you think not of a false god, you will not worship a manufactured god: for “there will not” be in you any strange god. “For I am.” Why would you adore what is not? “For I am the Lord your God”. Because “I am I that Am,” and indeed “I Am” He says, I that Am, over every creature: yet to you what good have I afforded in time? “Who brought you out of the land of Egypt.” Not to that people alone is it said. For we all were brought out of the land of Egypt, we have all passed through the Red Sea; our enemies pursuing us have perished in the water. Let us not be ungrateful to our God; let us not forget God that abides, and fabricate in ourselves a new god. “I, who led you out of the land of Egypt,” says God. “Open wide your mouth, and I will fill it.” You suffer straitness in yourself because of the new god set up in your heart; break the vain image, cast down from your conscience the feigned idol: “open wide your mouth,” in confessing, in loving: “and I will fill it,” because with me is the fountain of life.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)