Isaiah 54:9-10

The Lord is here pleased to make use of two very striking representations, to show the unalterable nature of his covenant promises in Christ to his people, namely, the covenant made at the deluge, and the durableness of mountains. To this hour the former holds good; for though so many generations have passed, every day again proves God's faithfulness, Genesis 8:21-22 ; the latter may be more easily accomplished, by the removal of mountains, than that God's promises in Christ should fail; Psalms 89:30-35 .