Almost everytime God promises something in the Bible it comes with a big "IF"... We've got to do our part in the agreement -- the covenant is always 2-sided!!

"'You have seen what I did to the Egyptians. You know how I brought you to myself and carried you on eagle's wings. Now if you will obey me and keep my covenant, you will be my own special treasure from among all the nations of the earth; for all the earth belongs to me. And you will be to me a kingdom of priests, my holy nation.' Give this message to the Israelites." Exodus 19:4-6