13 “And Your right hand shall lead You on marvellously.” We shall be guided on by His right hand: He by His own. For He is God, we mortal men. He was led on by His own right hand; i.e. by His own power. For the power which the Father has, He has also; the Father's immortality He has also; He has the Father's Divinity, the Father's Eternity, the Father's Power. Marvellously will His right hand lead Him on, performing the works of God; undergoing human sufferings, overthrowing the evil wills of men by His own goodness. Even now, He is being led on even to places where as yet He is not; and it is His own right hand that is leading Him on. For that is leading Him there which He has Himself bestowed upon His Saints. “Your right hand shall lead You on marvellously.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)