Romans 9:16

9:16 So then, it does not depend on human desire or exertion, but on God who shows mercy.

Romans 9:18-19

9:18 So then, God has mercy on whom he chooses to have mercy, and he hardens whom he chooses to harden.

9:19 You will say to me then, “Why does he still find fault? For who has ever resisted his will?”