Psalm 94:11
"The LORD knoweth the thoughts of man, that they are vanity."
Cross References (ranked by relevance)
1 Corinthians 3:20
And again, The Lord knoweth the thoughts of the wise, that they are vain.
1 Corinthians 1:19
For it is written, I will destroy the wisdom of the wise, and will bring to nothing the understanding of the prudent.
1 Corinthians 1:21
For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.
1 Corinthians 1:25
Because the foolishness of God is wiser than men; and the weakness of God is stronger than men.