Physics is like sex: sure, it may give some practical results, but that's not why we do it.

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

Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.

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

Never help a child with a task at which he feels he can succeed.

Investigate, educate and organize.

An investment in knowledge pays the best interest.

Imagination is more important than knowledge.

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

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

It is beyond a doubt that all our knowledge begins with experience.

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

Show me a family of readers, and I will show you the people who move the world.

Real learning comes about when the competitive spirit has ceased.

Human behavior flows from three main sources: desire, emotion, and knowledge

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

A thought is an idea in transit.

If I have seen further it is by standing on the shoulders of Giants.

If help and salvation are to come, they can only come from the children, for the children are the makers of men.

One test of the correctness of educational procedure is the happiness of the child.

That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach.