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

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

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

Books are for people who wish they were somewhere else.

The real solution lies in a world in which charity will have become unnecessary.

The most important part of teaching is to teach what it is to know.

Learning never exhausts the mind.

The white man is very clever. He came quietly and peaceably with his religion. We were amused at his foolishness and allowed him to stay. Now he has won our brothers, and our clan can no longer act like one. He has put a knife on the things that held us together and we have fallen apart.

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

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.

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.

Necessity is the mother of invention.

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

Education is the kindling of a flame, not the filling of a vessel.

If I have seen further it is by standing on the shoulders of Giants.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

Courage, conviction and confidence.

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

There is no authority who decides what is a good idea.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

Just when I thought there wasn't room enough for another thought in my head, I had this great idea.