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.

Necessity is the mother of invention.

There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.

A witty saying proves nothing.

If you can't explain it simply, you don't understand it well enough.

No power and no treasure can outweigh the extension of our knowledge.

Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.

The task of a writer is not to solve the problem but to state the problem correctly.

The secret of life is not enjoyment but education through experience.

The only good is knowledge and the only evil is ignorance.

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

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

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

The more I read, the more I acquire, the more certain I am that I know nothing.

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

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

To every action there is always an equal and opposite or contrary, reaction

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

Dare to think for yourself.

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.