Augustine Exposition on the Book of Psalms 18:3

3. “O Lord, My stay, and My refuge, and My deliverer” (ver. 2). O Lord, who hast stayed Me, because I sought refuge with Thee: and I sought refuge, because Thou hast delivered Me. “My God is My helper; and I will hope in Him.” My God, who hast first afforded me the help of Thy call, that I might be able to hope in Thee. “My defender, and the horn of My salvation, and My redeemer.” My defender, because I have not leant upon Myself, lifting up as it were the horn of pride against Thee; but have found Thee a horn indeed, that is, the sure height of salvation: and that I might find it, Thou redeemedst Me.