1 Corinthians 3:19

For the wisdom of this world is foolishness with God.

Wisdom of this world. All the efforts of men to find peace and happiness apart from God are doomed to failure. The study of human philosophy does not lead to God, but to the exaltation of the creature. The vain, self-confident opinions of the Greeks regarding religion are looked upon by God as folly (see ch. 1:19-21). God sees the imperfection of all human wisdom, for He sees everything as it really is. Anything that men seek to add to the simple gospel of Jesus is naturally marked by their own imperfect appreciation of the mind of God. The false teachers who had troubled the church at Corinth doubtless mixed their own speculations with the Scriptures.

It is written. A quotation from Job 5:13 (see comment there).

Their own craftiness. However cunning, clever, or skillful men may consider themselves to be, they cannot improve upon the Word of God. They cannot deceive God, nor can they produce a better plan than the divine plan. God can defeat their purposes and bring their plans to nothing. He does this by permitting them to demonstrate their folly and become entangled or ensnared by it (cf. Job 5:12; Isa. 8:10). The many different theological systems and religious philosophies found in the Christian world today illustrate the force of this statement.