What Did Aquinas Say About Crystal Healing?

It is not called divination if a man foretells things that happen of necessity, or in the majority of instances can be foreknown by human reason. If astrologers predict something that can be known with certainty, like an eclipse, that won't be divination. But if they try to predict things the stars can't tell, you, like what an individual will do with his free will, then it will be superstitious divination. So let's move on from astrology and look at some other subjects.