All dreams of this kind are very obviously formations such as one often meets on the vital, more rarely on the mental plane. Sometimes they are the formations of our own mind or vital; sometimes they are the formations of other minds with an exact or modified transcription in yours; sometimes formations come that are made by the non-human forces or beings of these other planes. These things are not true and need not become true in the physical world, but they may still have effects on the physical if they are framed with that purpose or that tendency and, if they are allowed, they may realise their events or their meaning, for they are most often symbolical or schematic in the inner or the outer life. The proper course with them is simply to observe and understand and, if they are from a hostile source, reject or destroy them.
There are other dreams that have not the same character but are a representation or transcription of things that actually happen on other planes, in other worlds under other conditions than ours. There are, again, some dreams that are purely symbolic and some that indicate existing movements and propensities in us, whether familiar or undetected by the waking mind, or exploit old memories or else raise up things either passively stored or still active in the subconscient, a mass of various stuff which has to be changed or got rid of as one rises into a higher consciousness. If one learns how to interpret, one can get from dreams much knowledge of the secrets of our nature and of other-nature.