Metaphysics is a term which was used by the compilers of Aristotle’s works for a part of them that appeared after the book of Physics. Later it was used as the title of the science which Aristotle dealt with in that section; a science that discusses the principles of existent qua existent. Since it delves into some of the fundamental problems of human beings such as God, self, and free will, this discipline has always been the main representative of philosophy. It is, in fact, only in the modern era that epistemology has gained more importance than metaphysics; moreover, some philosophers such as David Hume and Emanuel Kant have questioned its validity. In Hume’s view, metaphysics is an absurd field of science because its concepts are meaningless. In Kant’s view, metaphysical concepts and, thus, the related propositions are meaningful; however, it is impossible for theoretical wisdom to tackle them, and the solutions for metaphysical problems should be sought in the realm of practical wisdom or ethics. This paper reports and evaluates the viewpoints of these two philosophers in relation to metaphysics.