A red-hot evangelist, dressed in a morning coat & striped trousers & wearing a topper, walked down a busy street in London one day.
As he approached, people walking in the opposite direction from him read with amusement, smiles & jeers, the words he had had printed in large letters on a card fixed to the ribbon of his hat.
The words were - `A fool for Christ's sake.' When he passed, they turned to have another look at the man they thought to be a religious maniac & could not help seeing the card on the back of his topper which read, `Whose fool are you?'
1Co 3:18 (ISV): "Let no one deceive himself. If any of you thinks he is wise in the ways of this world, he must become a fool to become really wise."
1Co 1:25 (NET): "For the foolishness of God is wiser than human wisdom, and the weakness of God is stronger than human strength."