Sentence:  [T]hose deities which are called ‘chthonic' or earthly are, as a matter of fact, not in any sense deities of the earth. They are, in one of their aspects associated with the ‘underworld,' but that underworld is but a segment of their cycle; they are deities of the underworld not because they appertain to the earth or are in any sense a personification of it, but because they are, on the contrary, heavenly bodies which, in the course of their cycle, pass under the earth. They are therefore just as much ‘<WSD>uranian</WSD>' as are the Olympians. 
Meaning of the word marked with <WSD> tags:  Celestial, heavenly; uranic.