Being that, philosophy is concepts that cannot be explained in the empiricist and is pure theory. Other sciences even go the problem innumerable times, ties to certify its veracity, also has a difference here, therefore metaphysics does not work under simple concepts. Here it has the constatao of that it a posteriori has elements that they are a priori (REASONING) and (EXPERIENCE) of the knowledge. The citizen, to Observar it exerts on the object a power of which makes a collection of sensible data; through the sensation and of the perception. Thus, the mathematics and the physics for Kant had grown while science, when the scientists had perceived, exactly implicitly, that the reason is who commands objects and I do not oppose it (Copernicana Revolution). The agreement possesss of a priori or rational form the rules to know. Metaphysics is a priori and rational, it the sensation or perception is not given in. We can have idea of totality of world, God and Soul and not know it.

Kant considered similar inversion in philosophy. Until then, the theories consisted of adjusting the reason human being to the objects, that were, so to speak, ' ' center of gravidade' ' of the knowledge. Kant considered the opposite: the objects, from, would have there that to regulate themselves for the citizen, that would be the depositary of the forms of the knowledge. The laws would not be in the things of the world, but in the proper man; they would be spontaneous facultieses of its transcendental nature. As Kant it affirms in the preface of the second edition of the Critical one of the Pure Reason: ' ' So far one assumed that all our knowledge had that to regulate itself for objects; however all the attempts of by means of concepts establishing something a priori on the same ones, through what it would extend our knowledge, had failed under this presupposition.