How can you tell reality from hallucinations?

One book I just read talks about Synesthesia where one sense sparks another like domino train. Obvispulwu this relates to religion. I never understood who people csn trust their own experiences more than proven facts.

How can you tell reality from hallucinations?
How can you tell reality from hallucinations?
You can’t tell
You can tell (how?)
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How can you tell reality from hallucinations?
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