Plutarch, De defectu oraculorum
Frank Cole Babbitt, Ed.

‘And yet the school of Aristotle¹ would make it appear that exhalation is the author of all these changes that have taken place in the earth, and that things of this nature must of necessity follow with it in disappearing, changing their locality, and bursting forth once more in full vigour. Plainly the same sober opinion is to be held regarding the spirits that inspire prophecy ; the power that they possess is not everlasting and ageless, but is subject to changes. For excessive rains most likely extinguish them, and they probably are dispersed by thunderbolts, and especially, when the earth is shaken beneath by an earthquake and suffers subsidence and ruinous confusion in its depths, the exhalations shift their site or find completely blind outlets, as in this place they say that there are still traces of that great earthquake which overthrew the city. And in Orchomenos they relate that a pestilence raged and many persons died of it, and the oracle of Teiresias become altogether obsolescent and even to this day remains idle and mute. And if a like fate has befallen those in Cilicia, as we have been told, there is nobody, Demetrius, who could give us more certain information than you.’ [p. 481]