It is because logic only needs to deal with the form of arguments to determine issues of validity, and validity is its only concern, that it uses symbols to stand in place of elements in ordinary language. It does not use, and does not have to use, particular propositions like 'Sarah is standing on her head' in discussing validity, that is, the question of what follows from what.
it's too early to read this! maybe I'll try again after food.
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