Romans 9:14
For he says to Moses, 'I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.' — The citation of Exodus 33:19 grounds mercy (ἔλεος, eleos) in God's sovereign will: ἐλεέω (eleeō, "I will show mercy") is purely divine prerogative. God's compassion (σπλαγχνίζομαι, splagchnizgmai, "be moved with compassion") is not obligated but freely bestowed. Mercy is not owed; it is granted.