Giving responsibility is the key to success with boys, especially with the rowdiest and most difficult boys.

People are the key to success or extraordinary success.

Finding good partners is the key to success in anything: in business, in marriage and, especially, in investing.

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.