" In 2004, researchers Martin Seligman and Christopher Peterson published Character Strengths and Virtues, a manual with twenty-four such categories, divided into six groups: wisdom and knowledge—cognitive strengths that entail the acquisition and use of knowledge; courage—emotional strengths that involve the exercise of will to accomplish goals in the face of opposition, external or internal; humanity—interpersonal strengths that involve tending to and befriending others; justice—civic strengths that underlie healthy community life; temperance—strengths that protect against excess; and transcendence—strengths that forge connections to the larger universe and provide meaning. 9 "

― Jane McGonigal , Reality is Broken: Why Games Make Us Better and How They Can Change the World