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

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

To read is to fly: it is to soar to a point of vantage which gives a view over wide terrains of history, human variety, ideas, shared experience and the fruits of many inquiries.

Opinion is the medium between knowledge and ignorance.

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

A spirit of national masochism prevails, encouraged by an effete corps of impudent snobs who characterize themselves as intellectuals.

I am so clever that sometimes I don't understand a single word of what I am saying.

Any sufficiently advanced technology is indistinguishable from magic.

I have just three things to teach: simplicity, patience, compassion. These three are your greatest treasures.

Dare to think for yourself.

In mathematics you don't understand things. You just get used to them.

If there were no bad people, there would be no good lawyers.

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

Necessity is the mother of invention.

Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.

Liberty without Learning is always in peril and Learning without Liberty is always in vain.

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

The first principle is that you must not fool yourself and you are the easiest person to fool.

If you're teaching today what you were teaching five years ago, either the field is dead or you are.

The first idea the child must acquire is that of the difference between good and evil.

Education is an admirable thing, but it is well to remember from time to time that nothing that is worth knowing can be taught.