"The Book of Joy: Lasting Happiness in a Changing World" is a book written by the Dalai Lama and Desmond Tutu. In this book, the two spiritual leaders come together to discuss the nature of true joy and how to find it in our lives, even in the face of adversity and challenges. They share their personal stories, insights, and teachings, offering practical advice and guidance on how to cultivate joy and live a more fulfilling and meaningful life. The book explores various themes such as gratitude, forgiveness, compassion, and the power of perspective, providing readers with valuable tools and perspectives to navigate the ups and downs of life with greater joy and resilience.