Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands; That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world: But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ. For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us; Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace.
Ephesians 2:11-15
God operates only on the bases of covenants, agreements, solemn promises, sworn promises, oaths, and unbreakable covenants. Now the greatest of all is the eternal covenant sealed in the blood of Jesus. Our faith is greatly enriched and strengthened when we conduct our lives within the framework of this most robust and eternal covenant that God has bound himself to. He says, my covenant will I not break nor alter what has come out of my mouth. In this covenant blood of Jesus, he has undertaken full responsibility to guarantee our safety in this hostile world and times.