I should have clarified that I meant that in terms of having persuasive power over others.

Personal experience can be personally compelling, but people have pretty well exploited the "I personally experienced X, are you calling me a liar?" thing enough (also, hallucinations, confusion, unreliable memory, etc), that people generally take statements about personal experience of others with a grain of salt.

If I hallucinated a discussion with God, I would probably not be long-term convinced of it, despite the experience.

(Edit: Aside: why did I add anything past the first sentence? There was no reason to.)