Genius, Stupidity and The Infinite

From a genius (Albert Einstein) about being (or not being) one:

"... you all know the difference between genius & stupidity:

there is a limit to genius."
                                          Ref: http://www.quotedb.com/quotes/3834

"Only two things are infinite, the universe & human stupidity, 
and I'm not sure about the former."
                               Ref: http://www.quotedb.com/quotes/1349

"It's too bad that stupidity is not painful."
                                 Ref: Anon.