According to Fichte, The Vocation of Man is the doubt, the knowledge and the faith. Doubt breeds knowledge, which, if it is true metaphysical knowledge, shakes reality. Everything that follows this is just an area of faith. Believing that there is something beyond mere perception. That man is not empty, not only an image or a dream figure, but a closed reality that can never be open and deciphered, in which one can only believe. The eternal struggle between faith and knowledge begins when the dark demon who tempted Descartes, or the spirit that called Fichte destroys everything and leaves one alone in the darkness, for man to give birth to himself.