Romans 11:18

Boast not against the branches; i.e. against the Jews, who, because of their unbelief, are broken off; as if by nature thou wert better than they, or more worthy of that grace which is bestowed on thee. The word signifies: Throw not up thy neck, do not carry thyself scornfully and insultingly. But if thou boast, thou bearest not the root, but the root thee: q.d. If any will needs be so insolent, let them know and consider, that as the root is not beholden to the branches, but the branches to the root; so the good things that the Gentiles have, they received from the Jews, and not the Jews from them: the Gentile church is incorporated into the Jewish, and not the Jewish into the Gentile. Or else the meaning is: Despise not the Jews, for they are the natural branches of the root that bears them. If thou insultest over the branches, thou dost in a manner lift up thyself against the root, that once bore them, and now bears thee; even Abraham, who is the father of all them that believe. Abraham is not the root, simply and absolutely, but relatively, or by way of relation to his posterity and offspring.