Knowledge of the Higher Worlds by Rudolph Steiner set out to answer the question how knowledge of the higher worlds are attained. This book is a revised and enlarged edition of The Way of Initiation with Initiation and its Results. From Steiner’s intro:
There slumber in every human being, faculties by means of which he can acquire for himself a knowledge of higher worlds. Mystics, Gnostics, Theosophists – all speak of a world of soul and spirit, which for them is just as real as the world we see with our physical eyes and touch with our physical hands. At every moment the listener may say to himself: that, of which they speak, I too can learn, if I develop within myself certain powers which to-day still slumber within me.
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