The books that the world calls immoral are books that show the world its own shame.
Education is a system of imposed ignorance.
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.
Opinion is the medium between knowledge and ignorance.
The most savage controversies are those about matters as to which there is no good evidence either way.
Those who fail to learn the lessons of history are doomed to repeat them.
Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.
I have no special talents. I am only passionately curious.
The fullness of knowledge only comes through the awareness of ignorance.
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.
Never help a child with a task at which he feels he can succeed.
The deepest sin against the human mind is to believe things without evidence.
A thought is an idea in transit.
Education is our passport to the future, for tomorrow belongs to the people who prepare for it today.
All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.
The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.
When you know better you do better.
If there were no bad people, there would be no good lawyers.
God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.
Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.
What is freedom of expression? Without the freedom to offend, it ceases to exist.