22 What ye cried out a while ago at the very mention of peace, you cried from longing: your cry was from thirst, not from fullness; for there will be perfect righteousness where will be perfect peace. Now we hunger and thirst after righteousness. “They shall be filled.” How shall they be filled? When we have arrived at peace. Therefore when he had said, “Who has set peace for your borders,” because there is fullness and no want, he added at once, “and fills you with the fat of wheat”....
23. “Who sends forth His Word to the earth”. Behold, on earth we toil, weary, fainting, sluggish, cold: when should we be raised up to the fat of wheat that satisfies, did not He send His Word to the earth, whereby we were weighed down, to the earth, whereby we were hindered from returning? He sent His Word, He deserted us not even in the wilderness, He rained manna from heaven. “Who sends forth His Word to the earth;” and to earth His Word came. How? Or what is His Word? “Even unto swiftness His Word runs.” He said not, “His Word is swift,” but, “His Word runs even unto swiftness.” Let us understand, my brethren: He could not have chosen a better word. He who is hot grows hot by heat, he who is cold grows cold by cold, he who is swift becomes swift by swiftness....To what degree then does it run? “Even to swiftness.” Increase as much as you will the swiftness of the Word, and say, It is as swift as this or that, as birds, as the winds, as the Angels; is any of these as great as swiftness itself, “even unto swiftness”? What is swiftness itself, brethren? It is everywhere; it is not in part. This belongs to the Word of God, not to be in part, to be everywhere by Himself the Word, whereby He is “the Power of God and the Wisdom of God,” before He had taken flesh upon Him. If we think of God in the Form of God, the Word equal to the Father, this is the Wisdom of God, of which is said, “It reaches from one end to the other mightily.” What mighty speed! “It reaches from one end to the other mightily.”...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)