I don't know the key to success, but the key to failure is trying to please everybody.

People are the key to success or extraordinary success.

Failure is the key to success; each mistake teaches us something.

The key to success is action, and the essential in action is perseverance.

One important key to success is self-confidence. An important key to self-confidence is preparation.

Success is not the key to happiness. Happiness is the key to success. If you love what you do, you'll be successful.