Do not be arrogant toward the branches; but if you are arrogant, remember that it is not you who supports the root, but the root supports you.
You will say then, "Branches were broken off so that I might be grafted in." Quite right, they were broken off for their unbelief, but you stand by your faith.
Do not be conceited, but fear; for if God did not spare the natural branches, He will not spare you, either.
Source: "Paul's Epistle to The Romans"