From "Present Tense."
When I say or write something, there are actually a whole lot of different things I am communicating. The propositional content (the actual information I’m trying to convey) is only one part of it. Another part is stuff about me, the communicator. Everyone knows this. It’s a function of the fact that there are uncountably many well-formed ways to say the same basic thing, from e.g. “I was attacked by a bear!” to “Goddamn bear tried to kill me!” to “That ursine juggernaut bethought to sup upon my person!” and so on [...] “Correct” English usage is, as a practical matter, a function of whom you’re talking to and how you want that person to respond — not just to your utterance but also to you.