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There is nothing so stupid as the educated man if you get him off the thing he was educated in.

We are all born ignorant, but one must work hard to remain stupid.

How can smart women be so stupid about men sometimes? Lack of knowledge. It's what men have kept secret for so long.

How is it that little children are so intelligent and men so stupid? It must be education that does it.

Stupidity is the deliberate cultivation of ignorance.

Man has made use of his intelligence, he invented stupidity.

Men know everything - all of them - all the time - no matter how stupid or inexperienced or arrogant or ignorant they are.

Man is the inventor of stupidity.

The learned man knows that he is ignorant.

I have never met a man so ignorant that I couldn't learn something from him.