The only good is knowledge and the only evil is ignorance.

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

I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.

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

Courage, conviction and confidence.

Books are for people who wish they were somewhere else.

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

A witty saying proves nothing.

I think that kids have a greater capacity for processing things than we give them credit for.

There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.

The books that the world calls immoral are books that show the world its own shame.

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

The progressive development of man is vitally dependent on invention.

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

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

If I could explain it to the average person, I wouldn't have been worth the Nobel Prize.

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

Free the child's potential, and you will transform him into the world.

I cannot live without books.

The direction in which education starts a man will determine his future in life

If you're not learning while you're earning, you're cheating yourself out of the better portion of your compensation.