Education is the kindling of a flame, not the filling of a vessel.

Necessity is the mother of invention.

Never help a child with a task at which he feels he can succeed.

When you know better you do better.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

There is no authority who decides what is a good idea.

It is better to know how to learn than to know.

The ability to observe without evaluating is the highest form of intelligence.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

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

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

Investigate, educate and organize.

What sculpture is to a block of marble, education is to a human soul.

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

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

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.

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

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

Knowledge becomes evil if the aim be not virtuous.

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

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