Lucian of Samosata De astrologia 23

[23] Discerning all these things, the ancients had divination in very great use and counted it no parergy, but would found no cities, invest themselves with no ramparts, slay no men, wed no women, untill they had been advised in all particulars by diviners. And certainly their oracles were not aloof from astrology, but at Delphi a virgin hath the office of prophet in token of the celestial Virgin, and a serpent giveth voice beneath the tripod because a Serpent giveth light among the stars, and at Didymi also the oracle of Apollo hath its name, methinks, from the heavenly Twins. ¹