I am a part of everything that I have read.

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

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

When I am attacked by gloomy thoughts, nothing helps me so much as running to my books. They quickly absorb me and banish the clouds from my mind.

Common sense is the collection of prejudices acquired by age eighteen.

No man's knowledge here can go beyond his experience.

Know what you are talking about.

In mathematics you don't understand things. You just get used to them.

Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

Books are for people who wish they were somewhere else.

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 progressive development of man is vitally dependent on invention.

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.

A child educated only at school is an uneducated child.

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

It is not enough for the teacher to love the child. She must first love and understand the universe. She must prepare herself, and truly work at it.

The first idea the child must acquire is that of the difference between good and evil.

Necessity is the mother of invention.

Education is the most powerful weapon which you can use to change the world.

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