The Perennial Philosophy is a landmark comparative study of world mysticism and comparative religion written by Aldous Huxley. First published in 1945, the book explores the foundational universal truth shared by the major spiritual and philosophical traditions of the world, including Hinduism, Buddhism, Taoism, Sufism, and Christian mysticism. Huxley defines the perennial philosophy as the essential doctrine that recognizes a divine Reality underlying the material world of things, lives, and minds.

Combining primary-source anthology with insightful commentary, Huxley presents key excerpts from Western mystics, Eastern scholars, and ancient texts, organizing them around central themes such as the nature of the Divine Ground, self-transcendence, love, contemplation, and spiritual transformation. The work offers a profound reference for readers, researchers, and students seeking a unified understanding of human spirituality, comparative theology, and global philosophical heritage.آ