" Martin Seligman, the pioneer in positive psychology, has broken it down into three, measurable components: pleasure, engagement, and meaning.3 His studies have confirmed (though most of us know this intuitively) that people who pursue only pleasure experience only part of the benefits happiness can bring, while those who pursue all three routes lead the fullest lives.4 "

― Shawn Achor , The Happiness Advantage: The Seven Principles of Positive Psychology That Fuel Success and Performance at Work