Values and perception
If I like tomatoes and you do not, it is idle to discuss whether that is because we both experience the same physical tastes but value them differently, or because we have a common standard of valuation but experience different values. The alternatives are only verbally different, because there is no conceivable means of deciding between them. In just the same way, it is idle to discuss whether God is in the room and only one man is conscious of his prescence, or whether God is not in the room but one man is deluded into thinking that he is. Only the individual can answer that question in an intelligible way, and therefore no criterion of existence which can be generally accepted is possible.