Romans 11:11 answers the objection in 11:19: Israel's stumbling was not final but meant to provoke envy and bring salvation.

Romans 11:12 continues: if Israel's loss brought Gentile riches, their full inclusion will bring even greater riches — amplifying the response.

Romans 11:17 introduces the grafting metaphor that the objector in 11:19 misapplies — the wild olive is grafted in among natural branches, not replacing them.

Romans 11:23 shows that the broken-off branches can be grafted back if they repent, contradicting the objector's assumption that their removal is permanent.

Romans 11:24 argues from the lesser to greater: if wild branches can be grafted in, natural branches can be grafted back more easily.

Romans 11:21 directly addresses the objector's arrogance from 11:19 — if God did not spare natural branches, he will not spare the grafted wild branches.