Many have wondered if there is a key ingredient to living a full and happy life. For decades now, scientists and psychologists alike have been studying the strengths and virtues that enable individuals and communities to thrive. The positive psychology movement was founded on the belief that people want to lead meaningful and fulfilling lives, to cultivate what is best within themselves, and to enhance their experiences of love, work, and play. At the same time, acceptance and commitment therapy (ACT)¿a mindfulness-based, values-oriented behavioral therapy that has many parallels to Buddhism, yet is not religious in any way¿has been focused on helping people achieve their greatest human potential.

Created only years apart, ACT and positive psychology both promote human flourishing, and they often share overlapping themes and applications, particularly when it comes to setting goals, psychological strengths, mindfulness, and the clarification of what...