The highest activity a human being can attain is learning for understanding, because to understand is to be free.
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.
To every action there is always an equal and opposite or contrary, reaction
We could never learn to be brave and patient, if there were only joy in the world
If the facts don't fit the theory, change the facts.
It is beyond a doubt that all our knowledge begins with experience.
It is what you read when you don't have to that determines what you will be when you can't help it.
You can never be overdressed or overeducated.
The only true wisdom is in knowing you know nothing.
Reading without reflecting is like eating without digesting.
What we know is a drop, what we don't know is an ocean.
The task of a writer is not to solve the problem but to state the problem correctly.
There is nothing more awful, insulting, and depressing than banality.
Science is not only a disciple of reason but, also, one of romance and passion.
A child miseducated is a child lost.
If I have seen further it is by standing on the shoulders of Giants.
The whole of science is nothing more than a refinement of everyday thinking.
With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.
It is possible to fly without motors, but not without knowledge and skill.
I learned very early the difference between knowing the name of something and knowing something.
Just when I thought there wasn't room enough for another thought in my head, I had this great idea.