There is no authority who decides what is a good idea.

If you can't explain it simply, you don't understand it well enough.

To every action there is always an equal and opposite or contrary, reaction

Study without desire spoils the memory, and it retains nothing that it takes in.

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

The great difficulty in education is to get experience out of ideas.

Evil being the root of mystery, pain is the root of knowledge.

I don't look on poetry as closed works. I feel they're going on all the time in my head and I occasionally snip off a length.

Science is a way of thinking much more than it is a body of knowledge.

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

Don't learn to do, but learn in doing.

To educate a person in the mind but not in morals is to educate a menace to society.

A little knowledge is a dangerous thing. So is a lot.

Those who fail to learn the lessons of history are doomed to repeat them.

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

The fullness of knowledge only comes through the awareness of ignorance.

A witty saying proves nothing.

Knowledge becomes evil if the aim be not virtuous.

Suddenly degrees aren't worth anything. Isn't that true? When I was a student, if you had a degree, you had a job. If you didn't have a job it's because you didn't want one. And I didn't want one, frankly.

Knowing others is wisdom, knowing yourself is Enlightenment.

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.