Rom 11:17; But if some of the branches were broken off, and you, being a wild olive, were grafted in among them and became partaker with them of the rich root of the olive tree,
Rom 11:18; 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.
Rom 11:19; You will say then, “Branches were broken off so that I might be grafted in.”
Rom 11:20; Quite right, they were broken off for their unbelief, but you stand by your faith. Do not be conceited, but fear;
Rom 11:21; for if God did not spare the natural branches, He will not spare you, either.
"no matter how they behave themselves". Typical antimonian teaching. "You can live however you want, do whatever you want, sin all you want. God doesn't care."
Luke 8:14; The seed which fell among the thorns, these are the ones who have heard, and as they go on their way they are choked with worries and riches and pleasures of this life, and bring no fruit to maturity
Some start to bear fruit, (they couldn't do this on their own, without Jesus) but it never fully matures.