Romans 9:11-15, 18, 21

Yet, before the twins were born or had done anything good or bad—in order that God’s purpose in election might stand: not by works but by him who calls—she was told, “The older will serve the younger.” Just as it is written: “Jacob I loved, but Esau I hated.” What then shall we say? Is God unjust? Not at all! For he says to Moses, “I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion.”

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

Does not the potter have the right to make out of the same lump of clay some pottery for special purposes and some for common use?