For this reason, in spite of great and unceasing progress in the material world, we have closed the doors to another world of progress, a progress that can only be made by opening the doors to the deeper side of life. Man, by his form and features, by his physical construction, looks at one side and covers the other side with his own self. Man sees before him, but not behind him. As he is made so by nature and it happens to be his nature, he therefore cannot look into the deeper side while absorbed in the life on the surface.