To Plato, the god of the underworld was "an agent in beneficent cycle of death and rebirth" meriting worship under the name of "Plouton", a giver of spiritual wealth. In the dialogue "Cratylus", Plato has Socrates explain the etymology of "Plouton", saying that Pluto gives wealth ("ploutos"), and his name means "giver of wealth, which comes out of the earth beneath". Because the name Hades is taken to mean "the invisible", people fear what they cannot see; although they are in error about the nature of this deity's power, Socrates says, "the office and name of the God really correspond":