Knowing others is wisdom, knowing yourself is Enlightenment.

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

There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.

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

Imagination is the source of every form of human achievement. And it's the one thing that I believe we are systematically jeopardizing in the way we educate our children and ourselves.

Education is an ornament for the prosperous, a refuge for the unfortunate.

A thought is an idea in transit.

I learned very early the difference between knowing the name of something and knowing something.

Investigate, educate and organize.

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

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.

Don't worry that children never listen to you; worry that they are always watching you.

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

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

Any sufficiently advanced technology is indistinguishable from magic.

They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance.

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

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

Reading without reflecting is like eating without digesting.

Courage, conviction and confidence.

Imagination is more important than knowledge.