God's promises are spiritual blessings for believers in Christ (Ephesians 1:3). Covenant promises declare how God will work in us. It is the everlasting covenant, because it is made by the everlasting God. Jesus is the surety or guarantee of the covenant promises (Hebrews 7:22).
God's promises are guaranteed through the blood of Jesus Christ and His glorious resurrection, which is the gospel. It is an everlasting covenant that cannot be changed, because God changes not. "Now may the God of peace who brought up our Lord Jesus from the dead, that great Shepherd of the sheep, through the blood of the everlasting covenant ..." (Hebrews 13:20).
God promises to work through the lives of believers. Our lives please God, not because we are trying real hard. To the contrary, God works in us to will and do of His good pleasure (Philippians 2:13). That's God's everlasting covenant with us as believers. God will "make you complete in every good work to do His will, working in you, what is well pleasing in His sight, through Jesus Christ, to whom be glory, forever and ever. Amen" (Hebrews 13:21).
God's promises are for all believers in Christ. His work in us is through covenant. What He says, God will do. What He promises, God will fulfill. Our faith stands upon the promises of God through Jesus Christ. It is based upon God's covenant word. "So then faith comes by hearing, and hearing by the word of God" (Romans 10:17). Faith stands upon the word of God's covenant promises.
