Ps 80:10

“I would therefore beseech you, Pammachius, as a foremost lover of learning, and Marcella, as an outstanding examplar of Roman virtue, men who are bound together by faith and blood, to lend aid to my efforts by your prayers, in order that our Lord and Savior might in His own cause and by His mind make answer through my mouth. For it is He who says to the prophet, "Open thy mouth and I will fill it" (Psalm 81:10). For if He admonishes us, when we have been hailed before judges and tribunals, not to ponder what answer we are to give to them (Luke 12:11-12), how much more is He able to carry on His own war against blaspheming adversaries and through His servants to vanquish them?”

“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" [Psalm 81:10]. 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.”

“The door to wisdom is a yearning for it and a powerful desire. Hence the Psalm: "Open wide your mouth, and I will fill it." That is the road by which wisdom comes within me, by which I go into wisdom, and wisdom comes into me, and likewise charity. Such wisdom cannot be obtained without supreme mutual pleasure, but where there is supreme mutual pleasure, supreme yearning must have come first.”