1 Corinthians 3:18 in the King James Version
Let no man deceive himself. If any man among you seemeth to be wise in this world, let him become a fool, that he may be wise.
Context
17 If anyone destroys God’s temple, God will destroy him; for God’s temple is holy, which you are.
18 Let no one deceive himself. If anyone thinks that he is wise among you in this world, let him become a fool that he may become wise.
19 For the wisdom of this world is foolishness with God. For it is written, “He has taken the wise in their craftiness.”