I will open rivers on the bare heights, and springs in the midst of the valleys. I will make the wilderness a pool of water, and the dry land springs of water.
Alluding to the waters with which Israel was miraculously supplied in the desert after having come out of Egypt. high places--bare of trees, barren, and unwatered (Jer 4:11; Jer 14:6). "High places . . . valleys" spiritually express that in all circumstances, whether elevated or depressed, God's people will have refreshment for their souls, however little to be expected it might seem.
God needs no natural means to aid His Church; He has secret and wonderful methods that work when all outward hope is gone. The Lord displays His power most abundantly precisely when men see no ways forward and everything appears desperate, so we must trust Him then most of all, not be driven about by doubt.
AI summary
The poor and needy cry for water with parched tongues, but the Lord hears them and will not forsake them. He opens streams on barren hills and fountains in waterless valleys, turning desert into pools and drought into springs, so all may see and know that the hand of Jehovah has accomplished this.
AI summary
Commenting on Isaiah 41:17-20