I would say that there is a key difference between talking about a specific thing, no matter how extensive it is, like "the universe" as compared to talking about "existence" which would include "the universe" and, quite simply, everything. This would seem to be both metaphysics and epistemology (but more epistemological). For almost anything we can think of, it makes sense to ask about its origin. Where did you come from? What created this? etc. And that can predispose us to think that this is a property to be found of all things. But, consider a "thing" that is actually a category, like "mammals." If we ask where mammals come from, we will need to find a causal category that matches 'mammals.' It has to be a cause that works to explain humans, zebras, chimpanzees, etc. In other words, the cause must be of such a nature, epistemologically, as to match the effect we are imputing to it. We might say that the universe came from the big bang, but there has to have been something that existed prior to an effect for any causal explanation to work. (Remember Luke's warning to avoid the infinite regress). Now, if, instead of "the universe," we say, "existence" and mean by that "all that has ever existed," we have included whatever caused the big bang. We have, by the nature of the concepts, arrived at the point where we have to say that existence has always existed, and that existence cannot be made out of non-existence. If one were to say that it makes no sense for existence to be seen as eternal, that would be equivalent to saying that something could spring into existence from non-existence and clearly with no cause since a cause has to be about something that exists so as to be able to cause something to happen. I find it easier to accept that existence has always existed, and that there never was a time when nothing existed, then to accept an idea that could violate the very nature of causality and hold that anything could spring into being with no precursor whatsoever. And it appears to me that the confusion most often arises out of a conflation of astronomy's understanding of the 'universe' with the philosophical understanding of 'existence.'
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