For it is written, I will destroy the wisdom of the wise, and will bring to nothing the understanding of the prudent. Where is the wise? where is the scribe? where is the disputer of this world? hath not God made foolish the wisdom of this world? 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 1:19-21
For it is written: I will destroy the wisdom of the wise, and I will set aside the understanding of the experts. Where is the philosopher? Where is the scholar? Where is the debater of this age? Hasn’t God made the world’s wisdom foolish? For since, in God’s wisdom, the world did not know God through wisdom, God was pleased to save those who believe through the foolishness of the message preached. 1 Corinthians 1:19-21 HCSB
I'd say that being stupid is a mandate of Christianity and a prerequisite to the kind of peace you are discussing. Have you ever heard the term "fat, dumb, and happy"? You can call it intelligence if you wish. The Bible clearly calls it foolishness and applauds foolishness as a virtue.
It is no secret that intelligent people are more miserable than those with less intelligence. You are on the right track if happiness is your goal.