Paths to Knowledge of Higher Worlds

The assurance which our sense-perceptions provide from outside, consists in the fact that one sense supports the other. When we have an impression of sound or of sight, we do not immediately know whether this is a hallucination or not. We can only be sure of the impression gained, when we are supported — I might say — by the sense of gravitation, when another sense comes to our aid, when an impression which is not sufficiently guaranteed by the sense of sight or hearing can be supported by some other sense.