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

If you can't explain it simply, you don't understand it well enough.

Learning never exhausts the mind.

Any sufficiently advanced technology is indistinguishable from magic.

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

Don't learn to do, but learn in doing.

Civilization is a race between disaster and education.

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

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

The more I read, the more I acquire, the more certain I am that I know nothing.

An investment in knowledge pays the best interest.

Dare to think for yourself.

Necessity is the mother of invention.

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

In order to stave off covetouness, greed, and spite, citizens world over must be educated.

Books are as useful to a stupid person as a mirror is useful to a blind person.

To educate a person in the mind but not in morals is to educate a menace to society.

Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

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.

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

Human behavior flows from three main sources: desire, emotion, and knowledge