Romans 9:14–24: Mercy, Pharaoh, and the Potter
Paul faces the objection head-on: if God chooses whom to show mercy to, is he unjust? The passage answers no, grounding mercy in God's own declaration to Moses and in Pharaoh's raised-up ruin, then turning the question back on the creature who would judge the Creator.
Romans 9:14–24: Mercy, the Potter, and the Clay
Paul does not dodge the charge that God is unfair; he answers it by pointing to God's own declaration that mercy is his to give. The passage says yes, God sovereignly decides whom he saves, and it presents that sovereignty as the ground of mercy, not a threat to it.