If you were to catalogue every piece of knowledge that is stored in your mind, you would realize that you know more than you know. But how did all that knowledge get there? Was it by heavy contemplation of things, or was it through your own personal experience through your five senses that provided you with knowledge of the world around you? Continuing this study of philosophy and its consequences in our lives, Dr. Sproul discusses how John Locke came to his theory of knowledge.