Like other Enlightenment thinkers, John Locke set himself the task of rediscovering nature and placing human knowledge and reason on firm ground. In this lecture, Dr. Harry Binswanger introduces Locke’s basic philosophy, his metaphysics and epistemology, conceived with the goal of dispelling the errors of previous philosophies. In Binswanger’s estimation, Locke’s primaries—his views on consciousness, God, and the senses—continued the legacy of Cartesian errors. Yet he sees value in Locke’s view that all knowledge must ultimately be based on sense evidence and in his view that we control our own thinking. These provide a formula that, while inconsistently implemented, would cement man’s epistemological freedom from arbitrary political authority.