How do we know that all of God's promises are true?

The truthfulness of God's promises lies in His divine nature. As stated in Titus 1:2, God, who cannot lie, promised eternal life before the world began. This grounding in God's unchangeable character grants believers confidence that His promises will be fulfilled. Moreover, these promises are not only affirmative but also serve as a means by which God reveals His glory. When he declares a promise, it is rooted in His sovereign purpose and covenant, which means that they are guaranteed to come to fruition in Christ.