The Art of Tetman Callis

“Greek democracies could never pardon the introduction of new gods. Their objection to this was not, however, that the gods in question were false gods. If they had been so, it would not have mattered so much. What they could not tolerate was that any one should establish a private means of communication between himself and the unseen powers. This introduced, as it were, an unknown and incalculable element into the arrangements of the State, which might very likely be hostile to the democracy, and was in any case a standing menace to the mass of the citizens, who had no means of propitiating the intruding divinity. And it was nearly as bad to worship the ordinary gods of the State in a private way; for it was manifestly unfair that any section of the community should have access to the supreme dispensers of good and ill at times and seasons when the ordinary man was excluded. The religious creed of the Greek citizen may, in short, be summed up in the single tenet promulgated by the Delphic oracle that all must worship ‘according to the use of the city,’ and none must be suffered to gain the private ear of the gods for the furtherance of his own end.” – John Burnet, Early Greek Philosophy