" This passage is particularly interesting because it allows us to look deep into the world of obscure archetypal ideas that fill the mind of the alchemist. The author goes on to say that the steel, which is at the same time the “infernal fire,” the “key of our Work,” is attracted by the magnet, for which reason “our magnet” is the true “minera” (raw material) of the steel. The magnet has a hidden centre which “with an archetic appetite38 turns towards the Pole, where the virtue of the steel is exalted.” The centre “abounds in salt”—evidently the sal sapientiae, for immediately afterwards the text says: “The wise man will rejoice, but the fool will pay small heed to these things, and will not learn wisdom, even though he see the outward-turned central Pole marked with the notable sign39 of the Almighty. "

― C.G. Jung , Aion (Collected Works 9ii)