I am indebted to my father for living, but to my teacher for living well.

Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

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

Real knowledge is to know the extent of one's ignorance.

The only good is knowledge and the only evil is ignorance.

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

Any sufficiently advanced technology is indistinguishable from magic.

What is now proved was once only imagined.

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.

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 man who is fond of books is usually a man of lofty thought, and elevated opinions.

It isn't what we don't know that gives us trouble, it's what we know that ain't so.

Real learning comes about when the competitive spirit has ceased.

A little knowledge that acts is worth infinitely more than much knowledge that is idle.

In order to stave off covetouness, greed, and spite, citizens world over must be educated.

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

No man's knowledge here can go beyond his experience.

God created man in His own image, says the Bible; philosophers reverse the process: they create God in theirs.

There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.

The delight of opening a new pursuit, or a new course of reading, imparts the vivacity and novelty of youth even to old age.

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