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
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