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

Most people have never learned that one of the main aims in life is to enjoy it.

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

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

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

Learning never exhausts the mind.

Imagination is more important than knowledge.

Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.

Books are as useful to a stupid person as a mirror is useful to a blind person.

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

No power and no treasure can outweigh the extension of our knowledge.

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

For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

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

Knowledge is power. Information is liberating. Education is the premise of progress, in every society, in every family.

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

The only true wisdom is in knowing you know nothing.

If the facts don't fit the theory, change the facts.

The whole of science is nothing more than a refinement of everyday thinking.

The progressive development of man is vitally dependent on invention.

Opinion is the medium between knowledge and ignorance.