The term “logic” is used quite a lot, but not always in its technical sense. Logic, strictly speaking, is the science or study of how to evaluate arguments and reasoning. Logic is what allows us to distinguish correct reasoning from poor reasoning. Logic is important because it helps us reason correctly — without correct reasoning, we don’t have a viable means for knowing the truth or arriving at sound beliefs.
Logic is not a matter of opinion: when it comes to evaluating arguments, there are specific principles and criteria which should be used. If we use those principles and criteria, then we are using logic; if we aren’t using those principles and criteria, then we are not justified in claiming to use logic or be logical. This is important because sometimes people don’t realize that what sounds reasonable isn’t necessarily logical in the strict sense of the word.
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