Strict predestination makes God’s justice and mercy logically self-contradictory.

Evidence

If it were possible that God should just write a man down as saved, He failed in goodness if He did not write all down as saved; He could not in that case reward good actions or punish evil ones; He could not with mercy hear the penitence of the sinner. So argued San Pedro; a Christian, he said, asserted that the free will of men was proved by both Scripture and reason: God willed that Heaven should be earned, and men willed their own damnation. — Norman Daniel, Islam and the West, 878

Categorization

• DEFINE: Shows how medieval Christian apologists framed the internal contradiction of absolute predestination: it collapses God’s justice, mercy, and reward of merit.