“In the person of Jesus Christ the covenants of God achieve incarnational unity. Because Jesus, as the Son of God and mediator of the covenant, cannot be divided, the covenants cannot be divided. He himself guarantees the unity of the covenants, because He Himself is the heart of each of the covenantal administrations.”
~O. Palmer Roberston (The Christ of the Covenants, 52)
God does not-He cannot-change. Hold fast to this truth Christian. You are secure in the convent promises of God.