For as the rain cometh down, and the snow from heaven, and returneth not thither, but watereth the earth, and maketh it bring forth and bud, that it may give seed to the sower, and bread to the eater:
For as the rain cometh down ... and returneth not there, but watereth the earth. The hearts of men, once barren of spirituality, shall be made, by the outpouring of the Spirit under Messiah, to bear fruits of righteousness (Isaiah 5:6; Deuteronomy 32:2; 2 Samuel 23:4; Psalms 72:6).
And the snow from heaven - which covers plants from frost in winter, and, when melted in spring, waters the earth.
And returneth not there - void, as in Isaiah 55:11: it returns not in the same shade, or without 'accomplishing' the desired end.
And maketh it bring forth and bud - germinate.