If you can't explain it simply, you don't understand it well enough.
What sculpture is to a block of marble, education is to a human soul.
If the facts don't fit the theory, change the facts.
Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
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.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
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.
Education is the most powerful weapon which you can use to change the world.
The first principle is that you must not fool yourself and you are the easiest person to fool.
Any sufficiently advanced technology is indistinguishable from magic.
If there were no bad people, there would be no good lawyers.
Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.
They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.
An investment in knowledge pays the best interest.
It is what you read when you don't have to that determines what you will be when you can't help it.
Show me a family of readers, and I will show you the people who move the world.
The first idea the child must acquire is that of the difference between good and evil.
Opinion is the medium between knowledge and ignorance.