A person can be sure that their experience you are having right now "real" and not an illusion or hallucination when there is evidence all around and when a person have piece of mind.
When a person has a real hallucination, the person would be told that he or she is not worthy and as such they can experience bad odors or tastes and then they can be convinced that they are being poisoned.
Note that there is a form of consistency to the experience but fake hallucination is common all over the place, and can be a little bit distressing as well as abusive.
Therefore, A person can be sure that their experience you are having right now "real" and not an illusion or hallucination when there is evidence all around and when a person have piece of mind.
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