It is what you read when you don't have to that determines what you will be when you can't help it.

I do not know how to teach philosophy without becoming a disturber of the peace.

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

I cannot live without books.

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 is now proved was once only imagined.

It is possible to fly without motors, but not without knowledge and skill.

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

Real knowledge is to know the extent of one's ignorance.

The progressive development of man is vitally dependent on invention.

Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.

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

The great difficulty in education is to get experience out of ideas.

The books that the world calls immoral are books that show the world its own shame.

The man who does not read good books has no advantage over the man who can't read them.

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

A witty saying proves nothing.

When you know better you do better.

I like poems you can tack all over with a hammer and there are no hollow places.

I am so clever that sometimes I don't understand a single word of what I am saying.

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