How do we know the eternal covenant is true?

The eternal covenant, made between God the Father and God the Son before the foundation of the world, is established on God's eternal purpose and is guaranteed by the obedience of Christ. Jesus fulfills this covenant through His life, death, and resurrection, securing salvation for all of His chosen people. Scripture affirms that all of God's promises are fulfilled in Christ, showing that He is both the mediator and the guarantee of this eternal covenant. Thus, believers can trust that every promise made by God will be accomplished, as His faithfulness never wavers.