VIII. Concerning the Guardian of the Threshold and some Peculiarities of Clairvoyant Consciousness
On this account, and because people for the most part expect clairvoyance to be quite different from what it at first is, it often remains undiscovered by many earnest seekers after the spiritual world. In this respect too the meeting with the guardian of the threshold is important. If the soul has been strengthened just in the direction of self-knowledge, this very meeting may merely be like the first gentle flitting-by of a spiritual vision; but it will not be so easily consigned to oblivion as other supersensible impressions, because people are more interested in their own being than in other things.
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ENGPP1922