Augustine of Hippo
Since God embodies perfect righteousness, the apostle Paul promptly explained, For the Scripture states to Pharaoh, ‘For this very purpose I appointed you, that I might show my power over you, and that my name might be proclaimed in all the earth’ (Rom. 9:17). In summarizing the discussion on mercy and judgment, he further declares: Therefore he has mercy on whom he wishes; and whom he wishes he hardens (Rom. 9:18). His mercy is bestowed solely due to his immense goodness, while the hardening is not an act of injustice; thus, the justified cannot boast of their own merits, and the condemned can only mourn their transgressions. It is by grace alone that the redeemed are distinguished from the lost, who are united by a common origin in the predicament of perdition.