Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.

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

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

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

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.

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

It is beyond a doubt that all our knowledge begins with experience.

Study without desire spoils the memory, and it retains nothing that it takes in.

It is better to know how to learn than to know.

Necessity is the mother of invention.

Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.

Education is the best friend. An educated person is respected everywhere. Education beats the beauty and the youth.

What sculpture is to a block of marble, education is to a human soul.

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

If there were no bad people, there would be no good lawyers.

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

A witty saying proves nothing.

The most savage controversies are those about matters as to which there is no good evidence either way.

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

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

Learning never exhausts the mind.