Metaphysics is the branch of philosophy concerned with the most fundamental questions about reality, existence, being, causation, substance, mind, freedom, God, space, time and the ultimate nature of the universe. It attempts to go beyond the study of particular physical objects and seeks to understand the principles underlying reality as a whole. However, metaphysical inquiry has certain important limits because human knowledge, language, experience and reasoning are themselves limited. The first major limitation of metaphysics is the limitation of human experience. Human beings acquire knowledge primarily through sense perception, observation and experience. Metaphysics, however, frequently deals with realities that cannot be directly perceived, such as the soul, God, absolute reality or ultimate substance. Since such entities cannot be examined through ordinary empirical methods, metaphysical claims are difficult to verify objectively. A second limitation concerns the problem of knowledge. Metaphysical