Men are born ignorant, not stupid. They are made stupid by education.

One test of the correctness of educational procedure is the happiness of the child.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.

Seek knowledge from the cradle to the grave.

The most savage controversies are those about matters as to which there is no good evidence either way.

The first principle is that you must not fool yourself and you are the easiest person to fool.

A little knowledge is a dangerous thing. So is a lot.

Study without desire spoils the memory, and it retains nothing that it takes in.

All stable processes we shall predict. All unstable processes we shall control.

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

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

The deepest sin against the human mind is to believe things without evidence.

What is now proved was once only imagined.

A thought is an idea in transit.

You can never learn less, you can only learn more.

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

If I have seen further it is by standing on the shoulders of Giants.

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

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

Many much-learned men have no intelligence.