Just because I don't care doesn't mean I don't understand.

An investment in knowledge pays the best interest.

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

Knowing is not enough; we must apply. Willing is not enough; we must do.

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

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

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

Any sufficiently advanced technology is indistinguishable from magic.

As we acquire more knowledge, things do not become more comprehensible but more mysterious.

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.

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

The secret of life is not enjoyment but education through experience.

The knowledge of all things is possible

Science is a way of thinking much more than it is a body of knowledge.

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

Dare to think for yourself.

When you know better you do better.

If you want the present to be different from the past, study the past.

Books! I dunno if I ever told you this, but books are the greatest gift one person can give another.

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

The most important part of teaching is to teach what it is to know.