What God promises is with a covenant oath. His promises are based upon a covenant oath that cannot be broken. In ancient times, covenant vows were sealed in the death of a sacrificial animal. God's everlasting covenant is sealed in the blood of His Son (Hebrews 13:20). It's God's covenant word to every believer in Christ.
What God promises is forever. Our faith in God, the forgiveness of our sins, our eternal destiny, and God's work in our lives are all guaranteed through God's covenant word. "Forever O LORD, Your word is settled in heaven" (Psalm 119:89). God promised with a covenant oath forever.
What God promises is guaranteed. His oath of covenant promises are for every believer in Christ. Jesus is our surety or guarantee to the covenant promises that cannot be broken (Hebrews 7:22). The Bible declares God's word forever is settled in heaven. That's God's covenant word to every believer.
What God promises is for believers in Christ. We read the covenant promises in the Bible, which are forever the same. God has sworn with a covenant oath, and will not repent. He will not change His mind. "God, who cannot lie, promised before time began" (Titus 1:2). That's God's covenant promises for believers in Christ (2 Corinthians 1:20).