Moisture from heaven invariably accomplishes its intended purpose in helping meet human physical needs. The Word of God will likewise produce its intended results in fulfilling God’s spiritual purposes, especially the establishment of the Davidic kingdom on earth (vv. 1– 5 ). (Taken fro the John MacArthur Study Bible)

So will My word be which goes forth from My mouth; It will not return to Me empty, Without accomplishing what I desire, And without succeeding in the matter for which I sent it. Isaiah 55:11 NASB https://bible.com/verse-of-the-day/isa.55.11/30270