As Kenneth Clark said, “Manners are small morals.” I’d say the same about punctuation.
The part of the mind that remembers the rules for capitalization after a semicolon or whether to use “who” or “whom” is also the part of the mind that strives to think clearly about the matter in front of it. Punctuation guides our grammar and through our grammar it guides our consciousness.
Mary Norris, The New Yorker’s “comma Queen,” says as much in her latest piece. If you think of yourself as a member of The Resistance against the immorality and incompetence of those in power at the moment, she says that a good place to start is with a clean, beautiful statement of the truth. To speak truth to power, in other words, it is essential to first know how to speak.