I will go in the strength of the Lord GOD: I will make mention of your righteousness, even of yours only.
Read Chapter 71
Augustine of Hippo
18. With reason there followeth, "I will enter into the power of the Lord:" not mine own, but the Lord's. For they gloried in their own power of the letter, therefore grace joined to the letter they knew not. ...But because "the letter killeth, but the Spirit maketh alive:" "I have not known literature, and I will enter into the power of the Lord." Therefore this verse following doth strengthen and perfect the sense, so as to fix it in the hearts of men, and not suffer any other interpretation to steal in from any quarter. "O Lord, I will be mindful of Thy righteousness alone" (ver. 16). Ah! "alone." Why hath he added "alone," I ask you? It would suffice to say, "I will be mindful of Thy righteousness." "alone," he saith, entirely: there of mine own I think not. "For what hast thou which thou hast not received? But if also thou hast received, why dost thou glory as if thou hast not received." Thy righteousness alone doth deliver me, what is mine own alone is nought but sins. May I not glory then of my own strength, may I not remain in the letter; may I reject "literature," that is, men glorying of the letter, and on their own strength perversely, like men frantic, relying: may I reject such men, may I enter into the power of the Lord, so that when I am weak, then I may be mighty; in order that Thou in me mayest be mighty, for, "I will be mindful of Thy righteousness alone."