"Spark" by Jason Jaggard encourages everyone to discover their passion by getting outside their comfort zone and taking risks. In taking risks you find out what works for you or does not work for you. The purpose of taking risks is to change your life for the better or to make the world a better place. The author describes Spark groups where people come together to share with one another, encourage one another and keep one another accountable as risks are taken. The Spark groups are learning environments as people take steps to take risks in their lives. In taking healthy risks, it helps makes a person a better person or the world a better place. Along the way it helps a person to develop an appetite for good. The book contains a lot of practical information to help people understand and apply this principle in their lives.