How do you know what is real? If you are relying on your five senses to supply you with an answer, remember, there are many things in this world that cannot be seen, heard, or tasted. Yet even if you could empirically test whatever you encountered, what are the odds that your conclusions would apply in all cases? Do you depend on the law of averages for absolute certainty? In this message, Dr. Sproul discusses the relationship between metaphysics and epistemology as we search for certainty in the world around us.