If you're teaching today what you were teaching five years ago, either the field is dead or you are.

If help and salvation are to come, they can only come from the children, for the children are the makers of men.

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.

Opinion is the medium between knowledge and ignorance.

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

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

There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

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

The only true wisdom is in knowing you know nothing.

The fullness of knowledge only comes through the awareness of ignorance.

Books! I dunno if I ever told you this, but books are the greatest gift one person can give another.

A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.

Make it a rule never to give a child a book you would not read yourself.

We could never learn to be brave and patient, if there were only joy in the world

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

The progressive development of man is vitally dependent on invention.

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.

I am a part of everything that I have read.

Those who fail to learn the lessons of history are doomed to repeat them.

Science is not only a disciple of reason but, also, one of romance and passion.