6 “On a rock has He exalted me.” And that what I believed might be made manifest for salvation, He has made my confession to be conspicuous in His own strength. “And now, lo! He has exalted mine head above mine enemies”. What does He reserve for me at the last, when even now the body is dead because of sin, lo! I feel that my mind serves the law of God, and is not led captive under the rebellious law of sin? “I have gone about, and have sacrificed in His tabernacle the sacrifice of rejoicing.” I have considered the circuit of the world, believing on Christ; and in that for us God was humbled in time, I have praised Him with rejoicing: for with such sacrifice He is well pleased. “I will sing and give praises to the Lord.” In heart and in deed I will be glad in the Lord.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)