>>>Which is not meant to discredit his prophecy<<<
Really?
Yes, really.
There are many ‘ways’ to try and induce some kind of trance state to achieve a ‘closeness’ to God. Drugs are one way. Abstention from sex (worldly pleasures) is another and used by priests. Ritualistic starvation is another popular method.
The choice of method usually due more to accepted customs of the time. Whether the ‘prophecy’ they produce is ‘true’ is another story.