The definition of foolishness
Foolishness is being unaware of, or devoid of, social norms or skills leading to offense, annoyance, trouble, or injury.
For example, two men broke into the Palms and Cypress leasing office and poured gasoline all over the furniture. When one lit the gas, it unleashed a ball of flame setting both men on fire.
One of them ran away leaving “footprints of flame.”
Crime stoppers will pay $5000 for information leading to their capture… so if you see a man wearing charred shoes?
Just type foolishness into the YouTube search engine… foolishness is a woman setting fire to her neighbor’s home while being filmed on her own security camera.
Foolishness is trying to take a cell phone from a woman who has a black belt and teaches both kung fu and tae-kwan-do at a boxing club.
Foolishness is one of Mary Ella’s students trying to get into a local gang by beating someone up … he was a small boy and ended up getting beaten daily while trying to find someone he could beat up. Foolishness is trying to rob an older man in LaCrosse who, after he was robbed, chased down the robber, beat him up, tied his legs with plastic ties, and left him in the middle of the road threatening to break his fingers if he tried to get away!
With all that in mind, Paul in 1 Corinthians 1:18-25 NIV says, “For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God. 
For it is written: “I will destroy the wisdom of the wise; the intelligence of the intelligent I will frustrate.”  For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength.”
There are lots of people who believe the Bible is foolishness and weakness and I must confess I was one of them… it was a long time ago.
Over the years, I’ve come to believe the Bible is both wisdom and strength beyond our understanding.
But I’ll never forget someone saying, “The Bible is so simple, even a child can understand it and so deep, even the wisest man cannot completely understand it!”