Not only does he work all things according to his sovereign will, but he is just and holy. His ways are inscrutable, but we must accept them as just and righteous. His mercy and grace are beyond comprehension. But man, of all earthly creatures, is fallen and deserves his wrath. This we know from Scripture, the flawless record of his self-revelation in human history.
Foolishness is the antithesis of wisdom.
He has innate knowledge of God, but refuses to accept it. We all were born in the folly of ignorance. By storing God's Word in our hearts. Mere memorization of Scriptures or catechisms cannot impart this fear. These are but conduits of Spirit-given grace.