The original treatise introducing rational nondualism. What if Western thought is warped by an illusion so persuasive that it affects almost every aspect of our understanding, including modern science? Scientists look for objective knowledge. But suppose the distinction between the observer and the observed does not exist. This insight—called nondual recognition —is deeply counterintuitive; few grasp its full implications. Yet rational thought points to a nondual world, as articulated in Existential Rationalism . The realization forces us to reexamine the foundations of modern science: Without an objective reality, what makes empirical evidence scientific? This paradox takes us back to the 1700s when David Hume shook the foundations of rationalist philosophy with his compelling case for empiricism. Rationalism never fully recovered from his challenge. However, Eschauzier argues that nondual recognition is the missing piece to reinstate reason as the supreme scientific principle: Without an objective reality, reason justifies empirical science. Thus revitalized, rational thought’s four foundational principles still offer trailblazing clarity today. From understanding the dualistic disposition in psychology to nuancing quantum mechanics interpretations, Existential Rationalism charts a bold path forward, synthesizing ancient wisdom and modern science. “I am a firm believer that great things happen when different practices and schools of thought converge to create something new. Arts and hard sciences are often pitted against each other as contradictory and opposite ends of our spectrum of knowledge. This book is a wonderful example of how philosophy and science can be integrated to deepen our understanding of both. […] Kudos to the author for this inspiring contribution to the world!”—Amazon customer ⭐⭐⭐⭐⭐ "Perfect for lovers of philosophy and science." —Amazon customer ⭐⭐⭐⭐⭐ "A must-read for philosophy and science lovers alike!" —GoodReads reader ⭐⭐⭐⭐⭐ "Essential. Eye-opening vital philosophical read." —Amazon customer ⭐⭐⭐⭐⭐ "This is a book that can be very useful for whoever wants to have a more general image of the relation between Eastern and Western philosophy and understand how they can complete one another." —Amazon customer ⭐⭐⭐⭐⭐ "From the very first pages of the introduction, this book caught my attention. An engineer who likes philosophy, but had only been in contact with Western Philosophy, gets in touch with Eastern Philosophy. He discovers that the latter can help one understand things for which reason, the fundamental element of Western philosophy, cannot provide all the answers. I am an architect-engineer who likes to read philosophy but, being also an ardent supporter of reason, has only read Western philosophy, from the ancient Greeks (as a Greek-born) to more recent European philosophers. As a consequence, I was instantly intrigued by the author and this book and HAD to read it. Having done that, I must say this book was perfect for me, as I couldn't relate more to an author than I did with this one." —Amazon customer