Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

Opinion is the medium between knowledge and ignorance.

Books! I dunno if I ever told you this, but books are the greatest gift one person can give another.

What is now proved was once only imagined.

The whole of science is nothing more than a refinement of everyday thinking.

The knowledge of all things is possible

What is freedom of expression? Without the freedom to offend, it ceases to exist.

Necessity is the mother of invention.

If I could explain it to the average person, I wouldn't have been worth the Nobel Prize.

Common sense is the collection of prejudices acquired by age eighteen.

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.

The reading of all good books is like conversation with the finest men of past centuries.

Most people have never learned that one of the main aims in life is to enjoy it.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

Human behavior flows from three main sources: desire, emotion, and knowledge

An investment in knowledge pays the best interest.

I had rather excel others in the knowledge of what is excellent, than in the extent of my power and dominion

Educate the children and it won't be necessary to punish the men.

Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.

I think that kids have a greater capacity for processing things than we give them credit for.