All of us should know what a person is when we see one. But if you were asked to give a definition of a person that captured the essence of personhood to the exclusion of all other creatures, what would it be? Apply that challenge to everything else in the created order with the seemingly endless varieties of things and we begin to feel the weight of the problem. The ancient Greek philosopher Plato did, and in this message, Dr. Sproul helps us understand how Plato viewed the world.