The Apostle Paul
Romans 9:18BSB·traditional attribution

Therefore God has mercy on whom He wants to have mercy, and He hardens whom He wants to harden.

John Calvin Reformed @genevareformer

18. To whom he wills then he showeth mercy, etc. Here follows the conclusion of both parts; which can by no means be understood as being the language of any other but of the Apostle; for he immediately addresses an opponent, and adduces what might have been objected by an opposite party.

Matthew Henry Presbyterian @wholebiblehenry

The apostle, having asserted the true meaning of the promise, comes here to maintain and prove the absolute sovereignty of God, in disposing of the children of men, with reference to their eternal state. And herein God is to be considered, not as a rector and governor, distributing rewards and punishments according to his revealed laws and covenants, but as an owner and benefactor, giving...

Commenting on Romans 9:14-24

John Gill Reformed Baptist @doctorgill

Thou wilt say then unto me,.... That is, thou wilt object to me; for this is another objection of the adversary, against the doctrine the apostle was advancing: and it is an objection of a mere natural man, of one given up to a reprobate mind, of an insolent hardened sinner; it discovers the enmity of the carnal mind to God; if is one of...