First place Quote by Friedrich Nietzsche

“The German philosopher Nietzsche taught us that “the most common form of human stupidity is forgetting what one is trying to do.”

— Graham Allison

To forget one's purpose is the commonest form of stupidity.

— Friedrich Nietzsche

One of the most dangerous forms of human error is forgetting what one is trying to achieve.

— Paul Nitze

Stupidity is the deliberate cultivation of ignorance.

— William Gaddis

Stupidity is the basic building block of the universe.

— Frank Zappa

In a world that's smarter than it used to be and, in some ways, smarter than it ought to be, stupidity has a way…

— Walter Kirn

Stupidity is an attempt to iron out all differences, and not to use them or value them creatively.

— Bill Mollison

...stupidity is one of the two things we see most clearly in retrospect. The other is missed chances.

— Stephen King

Stupidity is a personal achievement which transcends national boundaries.

— Albert Einstein

We never really know what stupidity is until we have experimented on ourselves.

— Paul Gauguin

Stupidity is replicating itself at an enormous rate.

— Anonymous

Stupidity is much the same all the world over

— John Stuart Mill