Behold, the LORD's hand is not shortened, that it cannot save; neither his ear heavy, that it cannot hear:
The reason why Yahweh does not deliver His people, notwithstanding their religious services (Isaiah 58:3), is not want of power on His part, but because of their sins (Isaiah 59:1-8); Isaiah 59:9-15 contain their confession; Isaiah 59:16-21 the consequent promise of the Messiah.
Behold, the Lord's hand is not shortened, that it cannot save - (note, Isaiah 50:2.)
Neither his ear heavy, that it cannot hear - (Isaiah 6:10.)