Thought is the labour of the intellect, reverie is its pleasure.
(Victor Hugo)

If a little knowledge is dangerous, where is the man who has so much as to be out of danger?
(Thomas Henry Huxley)

Irrationally held truths may be more harmful than reasoned errors.
(Thomas Henry Huxley)

In the republic of mediocrity genius is dangerous.
(Robert G. Ingersoll)

A great many people think they are thinking when they are merely rearranging their prejudices.
(William James)

The art of being wise is the art of knowing what to overlook.
(William James)

Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
(Samuel Johnson)

Shallow understanding from people of good will is more frustrating than absolute misunderstanding from people of ill will. Lukewarm acceptance is much more bewildering than outright rejection.
(Martin Luther King Jr., Letter from Birmingham City Jail, 1963)

Intelligence, in diapers, is invisible. And when it matures, out the window it flies. We have to pounce on it earlier.
(Stanislaw J. Lec)

There's a fine line between genius and insanity. I have erased this line.
(Oscar Levant)