13 “Behold, O God our defender. And look on the face of Your Christ”. For when does God not look upon the face of His Christ? What is this, “Look on the face of Your Christ”? By the face we are known. What is it then, Look on the face of Your Christ? Cause Your Christ to become known to all. Look on the face of Your Christ: let Christ become known to all, that we may be able to go from strength to strength, that grace may abound, since sin has abounded.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)