Given the rich and diverse history in the discipline of philosophy, many a practicing philosopher might justifiably remark that insightful philosophical inquiry must withstand the test of time. Though “The Collapse of Philosophical Naturalism” was published in Telos in 1969, many of its insights remain highly relevant to conversations that continue in philosophical and sociopolitical circles today. Dale Riepe issues a damning critique, examining four at once distinct and kindred flaws in philosophical naturalism.