Plutarch De Defectu Oraculorum 43

[43] Those, however, who had reached the conclusion that the two are one and the same god very naturally dedicated the oracle to Apollo and Earth in common, thinking that the sun creates the disposition and temperament in the earth from which the prophet-inspiring vapours are wafted forth. As Hesiod, ¹ then, with a better understanding than some philosophers, spoke of the Earth itself as

Of All the unshaken foundation,

so we believe it to be everlasting and imperishable. But in the case of the powers associated with the earth it is reasonable that there should come to pass disappearances in one place and generation in another place, and elsewrhere shifting of location and, from some other source, changes in current, ² and that such cycles should complete many revolutions within it in the whole course of time, as we may judge from what happens before our eyes. For in the case of lakes and rivers, and even more frequently in hot springs, there have occurred disappearances and complete extinction in some places, and in others a stealing away, as it were, and sinking under ground ³ ; later they came back, appearing after a time in the same places or flowing out from below somewhere near. We know also of the exhaustion of mines, some of which have given out recently, as for example the silver mines of Attica and the copper ore in Euboea from which the cold-forged sword-blades used to be wrought, as Aeschylus ⁴ has said,

Euboean sword, self-sharpened, in his hand.

And it is no long time since the rock in Euboea ceased to yield, among its other products, soft petrous filaments like yarn. ⁵ I think some of you have seen towels, nets, and women’s head-coverings from there, which cannot be burned by fire; but if any become soiled by use, their owners throw them into a blazing fire and take them out bright and clear. To-day all this has disappeared, and there are scarcely any attenuated fibres or hairs, as it were, running through the mines.

[43] Those then that imagined that both were one and the same God have with good reason dedicated and consecrated this oracle to Apollo and to the earth, deeming it to be the sun which imprinted this temperature and disposition on the earth, from whence arose this predictive exhalation. For as Hesiod, with far better reason than other philosophers, calls the earth so do we esteem it eternal, immortal, and incorruptible. But as to the virtues and faculties which are in it, we believe that some fail in one place, and spring up anew in another. It seems also (for so some experiments incline us to conjecture) that these transitions, changes, and revolutions in process of time do circulate and return to the same place, and begin again where they left off. In some countries we see lakes and whole rivers and not a few fountains and springs of hot waters have sometimes failed and been entirely lost, and at others have fled and absconded themselves, being hidden and concealed under the earth; but perhaps some years after do appear again in the same place, or else run hard by. And so of metal mines, some have been quite exhausted, as the silver ones about Attica; and the same has happened to the veins of brass ore in Euboea, of which the best blades were made and hardened in cold water, as the poet Aeschylus tells us, It is not long since the quarry of Carystus has ceased to yield a certain soft stone, which was wont to be drawn into a fine thread; for I suppose some here have seen towels, net-work, and coifs woven of that thread, which could not be burnt; but when they were soiled with using, people flung them into the fire, and took them thence white and clean, the fire only purifying them. But all this is vanished; and there is nothing but some few fibres or hairy threads, lying up and down scatteringly in the grain of the stones, to be seen now in the quarry.