Jamieson, Fausset and Brown on Isaiah 55:11

11. (Mt 24:35). Rain may to us seem lost when it falls on a desert, but it fulfils some purpose of God. So the gospel word falling on the hard heart; it sometimes works a change at last; and even if so, it leaves men without excuse. The full accomplishment of this verse, and Is 55:12, 13, is, however, to be at the Jews' final restoration and conversion of the world (Is 11:9-12; 60:1-5, 21).