Two things are infinite: the universe and human stupidity; and I’m not sure about the universe.
The difference between genius and stupidity is; genius has its limits.
You can be sincere and still be stupid.
Life’s hard. It’s even harder when you’re stupid.
There is no sin except stupidity.
The majority of the stupid is invincible and guaranteed for all time. The terror of their tyranny, however, is alleviated by their lack of consistency.
Posterity will one day laugh at the foolishness of modern materialistic philosophers.
Forgetting our purpose is the most frequent form of folly.
When stupidity is considered patriotism, it is unsafe to be intelligent.
There are few enough people with sufficient independence to see the weaknesses and follies of their contemporaries and remain themselves untouched by them.
The University brings out all abilities, including stupidity.[Университет развивает все способности, в том числе — глупость.]
The stupid neither forgive nor forget; the naive forgive and forget; the wise forgive but do not forget.