17 “From the fruit of Your works shall the earth be satisfied.” What is, “From the fruit of Your works”? Let no man glory in his own works: but “he that glories, let him glory in the Lord.” With Your grace he is satisfied, when he is satisfied: let him not say that grace was given for his own merits. If it is called grace, “it is gratuitously given;” if it is returned for works, wages are paid. Freely therefore receive, because ungodly you are justified.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)