The purpose of this book (Theosophy) is to give a description of some of the regions of the supersensible world. The reader who is only willing to admit the existence of the sensible world will look upon this description as merely an unreal production of the imagination. Whoever looks for paths that lead beyond this world of the senses, however, will soon learn to understand that human life only gains in worth and significance through insight into another world. He will not, as many fear, be estranged from the “real” world through this new power of vision because only through it does he learn to stand securely and firmly in this life and learns to know the causes of life. Without this power of vision he gropes like a blind man through their effects. Only through the understanding of the supersensible does the sensible “real” acquire meaning. A man therefore becomes more and not less fit for life through this understanding. Only he who understands life can become a truly practical man.
Source: Rudolf Steiner – GA 9 – Theosophy – An Introduction to the Supersensible Knowledge of the World and the Destination of Man: From the prefaces to the first, second and third editions
Translated by Henry B. Monges and revised for this edition by Gilbert Church, Ph.D