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I recently bought a copper bracelet which I now wear. Since putting it on, I now experience vivid dreams every night because I sleep with the bracelet on. Prior to this, I would have dreamless sleep and the occasional dreams here and there in a year. Now I have these vivid dreams every night.

Now ...

So I've heard that there are people who actually invoke spirits/demons/angels and converse with them. My question is:
If this is the case, to what use then do these practitioners make of this knowledge that they gain from these beings? Shouldn't we by now have had practitioners who, as a result of ...