The philosophical debate as to whether we can believe in existence of unexperienced is not a new one. In fact it has been argued since the dawn of logic by the greatest philosophers our planet has had. It is a fundamental issue and also applies to issues such as existence of one god and after life (like it or not).
Quote:
Aristotle's criticism of Plato
Aristotle devotes special attention to the Platonic theory, according to which ideas are the ultimate principles of Being. That theory, he contends, was introduced to explain how things are, and how things are known; in both respects, it is inadequate. To postulate the existence of ideas apart from things is merely to complicate the problem; for, unless the ideas have some definite contact with things, they cannot explain how things came to be, or how they came to be known by us. Plato does not maintain in a definite, scientific way a contact between ideas and phenomena -- he merely takes refuge in expressions, such as participation, imitation, which, if they are anything more than empty metaphors, imply a contradiction. In a word, Aristotle believes that Plato, by constituting ideas in a world separate from the world of phenomena, precluded the possibility of solving by means of ideas the problem of the ultimate nature of reality.
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Though it may seem obvious at a 1st glance that, what we can only imagine is not sufficient proof as to its existence there are issues that we all believe without experiencing directly.
I have never been to Antarctica. Should I completely ignore its existence?
At the moment of feeling very hungry should I stop believing that there exists such a thing as the state of satiety?
Perhaps the most important issue here is not that, if extra universes exist or not but that, why does it matter to us.
If by definition we will never experience any features of the "other universes" if any, then why do we care? (Not suggesting we should stop to care but asking why do we indeed care to know)
Another issue here is if all of what we know is purely based on logic and direct/indirect experience, or instinct/intuition/global-conciseness has something to do with our beliefs. Instinct is a real factor and is programmed into our knowledge. Without the basic instincts we would not be able to understand/learn anything (not even language).