There are well-dressed foolish ideas, just as there are well-dressed fools

Fools are not Foolish.

There are no foolish questions, just fools asking questions

To be full of yourself is to make a fool of yourself.

The success of many books is due to the affinity between the mediocrity of the author's ideas and those of the public

It's better to stay silent and look a fool, rather than speak and remove all doubt.