And he took his staff in his hand, and chose him five smooth stones out of the brook, and put them in a shepherd's bag which he had, even in a scrip; and his sling was in his hand: and he drew near to the Philistine.
1 Samuel 17:40 KJV
https://bible.com/bible/1/1sa.17.40.KJV. 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.
1 Corinthians 3:18 KJV
https://bible.com/bible/1/1co.3.18.KJV