The greatest discovery of our generation is that human beings can alter their lives by altering their attitudes of mind. As you think, so shall you be.

Our prime purpose in this life is to help others. And if you can't help them, at least don't hurt them.

You have the right to remain silent, and I suggest you shut up!

Some are lost in the fire. Some are built by it.

At times, our own light goes out and is rekindled by a spark from another person. Each of us has cause to think with deep gratitude of those who have lighted the flame within us.

External nature is only internal nature writ large.

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.