Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.

What is now proved was once only imagined.

What we know is a drop, what we don't know is an ocean.

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

If one cannot enjoy reading a book over and over again, there is no use in reading it at all.

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.

I cannot live without books.

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

I learned very early the difference between knowing the name of something and knowing something.

Educate the children and it won't be necessary to punish the men.

Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.

To read is to fly: it is to soar to a point of vantage which gives a view over wide terrains of history, human variety, ideas, shared experience and the fruits of many inquiries.

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.

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

The schools ain't what they used to be and never was.

The progressive development of man is vitally dependent on invention.

I am a part of everything that I have read.

Courage, conviction and confidence.

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

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

Most people have never learned that one of the main aims in life is to enjoy it.