Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity. Martin Luther King, Jr.
The difference between stupidity and genius is that genius has its limits. Albert Einstein
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. Albert Einstein
Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. P. J. O'Rourke
The doctor sees all the weakness of mankind; the lawyer all the wickedness, the theologian all the stupidity. Arthur Schopenhauer