"The Metaphysics of Quality subscribes to what is called empiricism. It claims that all legitimate human knowledge arises from the senses or by thinking about what the senses provide. Most empiricists deny the validity of any knowledge gained through imagination, authority, tradition, or purely theoretical reasoning. They regard fields such as art, morality, religion, and metaphysics as unverifiable. The Metaphysics of Quality varies from this by saying that the values of art and morality and even religious mysticism are verifiable...".