Wonders and Marvels of Spiritual Science
It is also necessary to mention that the external and internal senses work together in spiritual science. Therefore, their spiritual training is extremely necessary. Just as a capable person before being sent into space, undergoes arduous physical exercises before going beyond the pull of gravity of the planet earth, similarly extremely strenuous exercise together with going beyond the pull of the sphere of carnality is a dire necessity to experience spiritual science. Otherwise it is possible for someone to dare to suggest that nothing exists by the name of “spiritual science”.
This excerpt has been taken from page 3.