15 “You are the God that doest wonderful things alone”. You are indeed a great God, doing wonderful things in body, in soul; alone doing them. The deaf have heard, the blind have seen, the feeble have recovered, the dead have risen, the paralytic have been strengthened. But these miracles were at that time performed on bodies, let us see those wrought on the soul. Sober are those that were a little before drunken, believers are those that were a little before worshippers of idols: their goods they bestow on the poor that did rob before those of others....“Wonderful things alone.”
Moses too did them, but not alone: Elias too did them, even Eliseus did them, the Apostles too did them, but no one of them alone. That they might have power to do them, You were with them: when You did them they were not with You. For they were not with You when You did them, inasmuch as You made even these very men. How “alone”? Is it perchance the Father, and not the Son? Or the Son, and not the Father? Nay, but Father and Son and Holy Ghost. For it is not three Gods but one God that does wonderful things alone, and even in this very leaper-over.
For even his leaping over and arriving at these things was a miracle of God: when he was babbling within with his own spirit, in order that he might leap over even that same spirit of his, and might delight in the works of God, he then did wonderful things himself. But God has done what? “You have made known unto the people Your power.” Thence this congregation of Asaph leaping over; because He has made known in the peoples His virtue. What virtue of His has He made known in the peoples? “But we preach Christ crucified,...Christ the power of God and the wisdom of God.” If then the virtue of God is Christ, He has made known Christ in the peoples. Do we not yet perceive so much as this; and are we so unwise, are we lying so much below, do we so leap over nothing, as that we see not this?
Source: The Enarrations, or Expositions, on the Psalms (New Advent)