The first part of this work is based on the analysis of reason and intuition as two different approaches to human knowledge gain. Furthermore, it will analyze the possible limits of rationality as well as expose why reason tends to be the dominant means of knowledge gain in western culture. In addition, methods of knowledge gain based on intuition, as well as the views of the philosophy of life will be foregrounded. Moreover, the first part shall show that reason and intuition interrelate as two sides of the same coin. Whereas reason serves the human being in order to conceive the world in its complexity, it is only through the faculty of intuition, which makes it possible to experience the unity of all being. In the second part of this work the experiencing of unity through intuition shall be discussed according to various views and approaches of modern science and oriental philosophy. Such experiences have been expressed through varying notions and terms, depending on the approach. However, a consensus exists with regard to the notion that the unity of being has to be experienced on an individual level, since such an experience goes beyond the capacity of reason. Only if man looks behind the scenes of rationality integrating his or her intuitive faculties, it will be possible to experience the primal ground of all being.