The first principle is that you must not fool yourself and you are the easiest person to fool.
Never help a child with a task at which he feels he can succeed.
The progressive development of man is vitally dependent on invention.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
What we know is a drop, what we don't know is an ocean.
Many much-learned men have no intelligence.
Learning never exhausts the mind.
Those who fail to learn the lessons of history are doomed to repeat them.
If you want the present to be different from the past, study the past.
I think that kids have a greater capacity for processing things than we give them credit for.
The schools ain't what they used to be and never was.
It is what you read when you don't have to that determines what you will be when you can't help it.
Dare to think for yourself.
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.
I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion
If the facts don't fit the theory, change the facts.
Common sense is the collection of prejudices acquired by age eighteen.
All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.
Education is the ability to listen to almost anything without losing your temper or your self-confidence.
Industrialize or perish.
The most savage controversies are those about matters as to which there is no good evidence either way.