“From of old no one has heard or perceived by ear, no eye has seen a God besides thee, who works for those who wait on him” (Isaiah 64:4) In other words, Isaiah is stunned that the greatness of God has the paradoxical effect that he does not need people to work for him, but rather magnifies himself by working for them, if they will renounce self reliance and “wait for him”.
John Piper
From the book “Let the Nations be Glad: Supremacy of God in Missions”