Grammar: The grave of letters. – Elbert Hubbard, The Roycroft Dictionary Concocted by Ali Baba and the Bunch on R

A kiss can be a comma, a question mark or an exclamation point. That’s basic spelling that every woman ought to know. – Mistinguett, quoted in Theatre Arts, Volume39, Issue12, 1955

Among the losses punctuation suffers through the decay of language is the slash mark or diagonal… – Theodor W. Adorno (1903–1969), “Punctuation Marks,” Notes to Literature, V

There are people who embrace the Oxford comma and people who don’t, and I’ll just say this: never get between these people when drink has been taken. – Lynne Truss, Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuation