Romans 11:17-20

If some of the branches have been broken off, and you, though a wild olive shoot, have been grafted in among the others and now share in the nourishing sap from the olive root, do not boast over those branches. If you do, consider this: You do not support the root, but the root supports you. You will say then, "Branches were broken off so that I could be grafted in." Granted. But they were broken off because of unbelief, and you stand by faith. Do not be arrogant, but be afraid.

If some of the branches have been broken off
Jeremiah 11:16 "The LORD called you a thriving olive tree with fruit beautiful in form. But with the roar of a mighty storm he will set it on fire, and its branches will be broken."
John 15:2 "He cuts off every branch in me that bears no fruit, while every branch that does bear fruit he prunes so that it will be even more fruitful."

and you, though a wild olive shoot, have been grafted in among the others
Acts 2:39 "The promise is for you and your children and for all who are far off--for all whom the Lord our God will call."
Ephesians 2:11-13 Therefore, remember that formerly you who are Gentiles by birth and called "uncircumcised" by those who call themselves "the circumcision" (that done in the body by the hands of men)--remember that at that time you were separate from Christ, excluded from citizenship in Israel and foreigners to the covenants of the promise, without hope and without God in the world. But now in Christ Jesus you who once were far away have been brought near through the blood of Christ.

You do not support the root, but the root supports you
John 4:22 "You Samaritans worship what you do not know; we worship what we do know, for salvation is from the Jews."

you stand by faith
1 Corinthians 10:12 So, if you think you are standing firm, be careful that you don't fall!
2 Corinthians 1:24 Not that we lord it over your faith, but we work with you for your joy, because it is by faith you stand firm.

Do not be arrogant
1 Timothy 6:17 Command those who are rich in this present world not to be arrogant nor to put their hope in wealth, which is so uncertain, but to put their hope in God, who richly provides us with everything for our enjoyment.

but be afraid
1 Peter 1:17 Since you call on a Father who judges each man's work impartially, live your lives as strangers here in reverent fear.

NOTES:
The fear of God - Genesis 20:11; Proverbs 3:7; Philippians 2:12-13; Hebrews 4:1
Read Romans 8

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.