"Black seems to make a colour cloudy, but darkness doesn't. A ruby could thus keep getting darker without ever becoming cloudy; but if it became blackish red, it would become cloudy."

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The mental body, like the astral, varies much in different people; it is composed of coarser or of finer matter, according to the needs of the more or less unfolded consciousness connected with it. In the educated it is active and well-defined; in the undeveloped it is cloudy and inchoate.

— Annie Besant