Patience is a virtue, and I'm learning patience. It's a tough lesson.

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

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

What is now proved was once only imagined.

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

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.

I decided to teach because I think that any person who studies philosophy has to be involved actively.

He who would learn to fly one day must first learn to stand and walk and run and climb and dance; one cannot fly into flying.

The most savage controversies are those about matters as to which there is no good evidence either way.

Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.

The man who does not read good books has no advantage over the man who can't read them.

Necessity is the mother of invention.

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

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

I like poems you can tack all over with a hammer and there are no hollow places.

I do not know how to teach philosophy without becoming a disturber of the peace.

Education is the kindling of a flame, not the filling of a vessel.

Seek knowledge from the cradle to the grave.

A child miseducated is a child lost.

The deepest sin against the human mind is to believe things without evidence.

Language is courage: the ability to conceive a thought, to speak it, and by doing so to make it true.