Nothing in all the world is more dangerous than sincere ignorance and conscientious stupidity

The ignorant torment themselves more than they do others.

Wisdom is prevented by ignorance, and delusion is the result.

The world is fettered by the chain forged by superstition and ignorance.

Ignorance is when you don't know something and somebody finds it out.

Nothing is more terrible than to see ignorance in action.

I do not pretend to know what many ignorant men are sure of.

To act without clear understanding, to form habits without investigation, to follow a path all one's life without knowing where it really leads-such is the behavior of the multitude.

I believe that much of the maladjustment in our societies is caused, not by malevolence and corruption, but simply by ignorance.

It is better to know nothing than to know what ain't so.