
There are four types of light substance that affect all forms of life on our planet. We have the light of the sun, the light in the planet itself (its own inherent radiance) and a light seeping in steadily and gradually from the astral plane that is slowly fusing with the other two types of radiance. The fourth type comes from the mental plane—a light in its turn reflected from the realm of the soul. The quality of light substance, we read, has changed several times during the ages, and as it has changed it has produced corresponding mutations in the phenomenal world.
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