Self-discovery is the key to knowing what to do with your life.
Before anything else, preparation is the key to success.
The key to success is to get out into the store and listen to what the associates have to say.
Giving responsibility is the key to success with boys, especially with the rowdiest and most difficult boys.
A graduation ceremony is an event where the commencement speaker tells thousands of students dressed in identical caps and gowns that 'individuality' is the key to success.