The Apostle Paul
Romans 11:18BSB·traditional attribution

do not boast over those branches. If you do, remember this: You do not support the root, but the root supports you.

John Calvin Reformed @genevareformer

18. But if thou gloriest, thou bearest not the root, etc. The Gentiles could not contend with the Jews respecting the excellency of their race without contending with Abraham himself; which would have been extremely unbecoming, since he was like a root by which they were borne and nourished.

Matthew Henry Presbyterian @wholebiblehenry

The apostle proposes here a plausible objection, which might be urged against the divine conduct in casting off the Jewish nation (Rom 11:1): "Hath God cast away his people? Is the rejection total and final? Are they all abandoned to wrath and ruin, and that eternal?

Commenting on Romans 11:1-32

John Gill Reformed Baptist @doctorgill

Boast not against the branches,.... Those that were broken off: the apostle would not have them vaunt it over them, despise them, and trample upon them; but pity them, and pray for and be abundantly thankful and humbled before God, under a sense of Ida sovereign and distinguishing grace, who had settled them in a Gospel church state, who were before comparable to a wild...