Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

Better know nothing than half-know many things.

All stable processes we shall predict. All unstable processes we shall control.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.

The deepest sin against the human mind is to believe things without evidence.

I decided to teach because I think that any person who studies philosophy has to be involved actively.

Knowing is not enough; we must apply. Willing is not enough; we must do.

A spirit of national masochism prevails, encouraged by an effete corps of impudent snobs who characterize themselves as intellectuals.

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.

Science is a way of thinking much more than it is a body of knowledge.

Learning gives creativity, Creativity leads to thinking, Thinking provides knowledge, Knowledge makes you great.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

Opinion is the medium between knowledge and ignorance.

A little knowledge that acts is worth infinitely more than much knowledge that is idle.

Courage, conviction and confidence.

If the facts don't fit the theory, change the facts.

Just because I don't care doesn't mean I don't understand.

Real knowledge is to know the extent of one's ignorance.

A child miseducated is a child lost.