Romans 11:17-21

It is as if some of the branches from an olive tree have been broken off. You non-Jewish people are like the branch of a wild olive tree that has been joined to that first tree. You now share the strength and life of the first tree, the Jews. So do not brag about those branches that were broken off. If you brag, remember that you do not support the root, but the root supports you. You will say, “Branches were broken off so that I could be joined to their tree.” That is true. But those branches were broken off because they did not believe, and you continue to be part of the tree only because you believe. Do not be proud, but be afraid. If God did not let the natural branches of that tree stay, then he will not let you stay if you don’t believe.