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.
When stupidity is considered patriotism, it is unsafe to be intelligent.
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.
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.
The most exquisite Folly is made of Wisdom spun too fine.
The more stupid the peasant, the better does the horse understand him.[Чем человек (крестьянин) глупее, тем легче его понимает лошадь.]