“Lord, make me to know mine end”. For some things I have passed by already; and I have arrived at a certain point, and that to which I have arrived is better than that from which I have advanced to this; but yet there remains a point, which has to be left behind. For we are not to remain here, where there are trials, offenses, where we have to bear with persons who listen to us and cavil at us. “Make me to know mine end;” the end, from which I am still removed, not the course which is already before me.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)