To the end, a psalm of David himself.
1. What “to the end” means, must not be too often repeated. “For Christ is the end of the law for righteousness to every one that believes;” as the Apostle says. We believe in Him, when we begin to enter on the good road: we shall see Him, when we shall get to the end. And therefore is He the end.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)