“The LORD is slow to anger but great in power; the LORD will not leave the guilty unpunished.” (Nahum 1:3)
Nahum of Elkosh prophesied the fall of Nineveh, probably between the fall of Thebes in 663 BC (mentioned in 3:8) and the fall of Nineveh itself in 612 BC. He is the sequel to Jonah: where Jonah proclaimed Nineveh's potential destruction and the city repented, Nahum proclaims the actual destruction of a Nineveh that has returned to its violence. The book is a sustained poem of fierce intensity - a literary masterpiece of divine judgment.
The LORD is a jealous and avenging God; the LORD takes vengeance and is filled with wrath. The LORD is slow to anger but great in power; the LORD will not leave the guilty unpunished. His way is in the whirlwind and the storm, and clouds are the dust of his feet. The mountains quake before him and the hills melt away. Who can withstand his indignation? Who can endure his fierce anger? But the LORD is good, a refuge in times of trouble. He cares for those who trust in him.
The Catechism identifies the divine attributes in Nahum 1 - jealous, avenging, slow to anger, great in power, good, a refuge - as the fullest Old Testament portrait of the God who is simultaneously the judge of the wicked and the shelter of the trusting (CCC 212).
Brothers and sisters, the LORD is slow to anger but great in power. Slow to anger is not unable to anger. The patience is real; the power is also real. Nineveh had already experienced the patience once, in Jonah's day. They exhausted it. The patience of God is the gift of the interval between sin and consequence. Do not mistake the patience for indifference or the slowness for weakness.
Lord God, slow to anger but great in power, be our refuge in times of trouble. We trust in you. Through Christ our Lord. Amen.