Translation: Nothing conveys the feeling of infinity as much as stupidity does.

There are so many different kinds of stupidity, and cleverness is one of the worst.

There is nothing more horrifying than stupidity in action.

To be considered stupid and to be told so is more painful than being called gluttonous, mendacious, violent, lascivious, lazy, cowardly: every weakness, every vice, has found its defenders, its rhetoric, its ennoblement and exaltation, but stupidity hasn’t.

Stupid, stupid, stupid!

I envy stupidity, stupidity is eternal.

What is it you most dislike? Stupidity, especially in its nastiest forms of racism and superstition.

It is not always easy to diagnose. The simplest form of stupidity — the mumbling, nose-picking, stolid incomprehension — can be detected by anyone. But the stupidity which disguises itself as thought, and which talks so glibly and eloquently, indeed never stops talking, in every walk of life is not so easy to identify, because it marches under a formidable name, which few dare attack. It is called Popular Opinion.

Obstinacy and vehemency in opinion are the surest proofs of stupidity.

Inhumanity is the keynote of stupidity in power.

stupidity can be as bad as malice

Seriously?
Yep.
That's a really stupid way to go through life.
It's how most people do.
Then most people are really stupid.

The sad thing about true stupidity is that you can do absolutely nothing about it.

Stupidity is a talent for misconception.