Perennial Philosophy is a perspective that suggests a universal truth underlying all major world religions. It posits that despite cultural differences, there are common spiritual principles that connect humanity. This philosophy emphasizes the importance of inner experience and the pursuit of spiritual enlightenment, often highlighting the unity of existence. Key figures associated with Perennial Philosophy include Aldous Huxley, who popularized the term in his book "The Perennial Philosophy." The philosophy draws from various traditions, including Buddhism, Christianity, and Hinduism, suggesting that these paths ultimately lead to the same fundamental truths about the nature of reality and human existence.