Leibniz called the principle of sufficient reason. This states that every time we identify some aspect of the universe which seemingly might be different, we will discover, on further examination, a rational reason why it is so and not otherwise. For example, given present knowledge, it seems that space might have more or less than three dimensions. (By this I mean the three large dimensions that we see around us; this doesn’t count hypothetical tiny, “rolled-up” dimensions perceivable only on a subatomic scale.) This is because all our current theories, including general relativity and
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