This book is devoted to the study of one of the fundamental themes of insight meditation (vipassana): the Four Foundations of Mindfulness. It reveals the most important concepts of Theravada Buddhism—such as the Four Noble Truths, the Noble Eightfold Path, hindrances, fetters, factors of enlightenment, and more—as well as providing practical instructions and meditation techniques on the Four Foundations. All topics are illustrated with examples drawn from the teachings of the Buddha himself. Here, beginning practitioners will find clear and accessible explanations of the main issues related to meditation, while experienced practitioners will find pointers that will help them deepen their practice and move forward along the path indicated by the Buddha.