Necessity is the mother of invention.
If the facts don't fit the theory, change the facts.
Show me a family of readers, and I will show you the people who move the world.
It took us three years to build the NeXT computer. If we'd given customers what they said they wanted, we'd have built a computer they'd have been happy with a year after we spoke to them - not something they'd want now.
A cynic is a man who knows the price of everything, and the value of nothing.
Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.
If I have seen further it is by standing on the shoulders of Giants.
What we know is a drop, what we don't know is an ocean.
The most important part of teaching is to teach what it is to know.
Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.
He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.
Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.
The deepest sin against the human mind is to believe things without evidence.
Opinion is the medium between knowledge and ignorance.
Don't learn to do, but learn in doing.
Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.
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.
Industrialize or perish.
I am so clever that sometimes I don't understand a single word of what I am saying.
I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.
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.