For as the rain and the snow come down from heaven and do not return there but water the earth, making it bring forth and sprout, giving seed to the sower and bread to the eater, so shall my word be that goes out from my mouth; it shall not return to me empty, but it shall accomplish that which I purpose, and shall succeed in the thing for which I sent it.
Isaiah 55:10-11

God's Word always has an impact. No matter how poorly conveyed nor how deaf the spiritual ear to which it is given, God's Word changes the people who hear it. His promises are never in vain. He has never given a single idle word. If he says something will happen, then it will happen.