Men are born ignorant, not stupid. They are made stupid by education.

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 deepest sin against the human mind is to believe things without evidence.

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

What is now proved was once only imagined.

The fullness of knowledge only comes through the awareness of ignorance.

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

I decided to teach because I think that any person who studies philosophy has to be involved actively.

It is possible to fly without motors, but not without knowledge and skill.

Patience is a virtue, and I'm learning patience. It's a tough lesson.

When you know better you do better.

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

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

I like poems you can tack all over with a hammer and there are no hollow places.

Education is a system of imposed 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.

Just when I thought there wasn't room enough for another thought in my head, I had this great idea.

You can never learn less, you can only learn more.

A cynic is a man who knows the price of everything, and the value of nothing.

A child miseducated is a child lost.

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