Reading is to the mind what exercise is to the body.

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.

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

That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.

Any sufficiently advanced technology is indistinguishable from magic.

As we acquire more knowledge, things do not become more comprehensible but more mysterious.

Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.

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

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

The progressive development of man is vitally dependent on invention.

Imagination is more important than knowledge.

Those who fail to learn the lessons of history are doomed to repeat them.

Investigate, educate and organize.

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion

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

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

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.

What is now proved was once only imagined.

The only true wisdom is in knowing you know nothing.

Liberty without Learning is always in peril and Learning without Liberty is always in vain.