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Good point.But you where the statements logic operates on come from isn't a problem logic helps you with. In science you can get them through observation and statistics, but even an individual scientist doesn't do every experiment themselves. For the most part we all (provisionally) accept or reject things others have told us for arbitrary reasons, and in order to share our knowledge and beliefs we need to convince others to (provisionally) accept the things we tell them. That is what rhetoric is for. Plato rightly distrusted it because you can use the tools of rhetoric to mislead people, but as we can't directly share our experiences it's the only tool there is.