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.

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

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

Courage, conviction and confidence.

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

Better know nothing than half-know many things.

I am indebted to my father for living, but to my teacher for living well.

Investigate, educate and organize.

What is now proved was once only imagined.

Imagination is more important than knowledge.

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

If the facts don't fit the theory, change the facts.

There is nothing more awful, insulting, and depressing than banality.

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 thought is an idea in transit.

The progressive development of man is vitally dependent on invention.

Science is a way of thinking much more than it is a body of knowledge.

The knowledge of all things is possible

Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

It took us three years to build the NeXT computer. If we'd given customers what they said they wanted, we'd have built a computer they'd have been happy with a year after we spoke to them - not something they'd want now.

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