The Power of Now — Eckhart Tolle (1997)

Eckhart Tolle's The Power of Now has sold 8 million copies and has been translated into 33 languages. Its central argument — that virtually all human suffering arises from either regret about the past or anxiety about the future, and that liberation lies in presence to the current moment — synthesises Buddhist mindfulness, Advaita Vedanta, and Jungian psychology into a practical guide accessible to Western secular readers.