God is faithful

God is faithful to all His promises, nor can He fail, or deceive; He is all wise and foreknowing of everything that comes to pass; He never changes His mind, nor forgets His word; and He is able to perform, and is the God of truth, and cannot lie; nor has He ever failed in any one of His promises, nor will He suffer His faithfulness to fail; and this is a strong argument to hold fast a profession of faith.

John Gill (Commentary on Hebrews 10:23)