"1. If nothing else, one ought to know how to treat a comma. Abandonment or abuse of the comma muddles discourse, and this lack of respect is akin to neglect, to a lack of appreciation, to an unreasonable rejection of the very foundation of all worthy human interactions.
2. Even in its more seemingly prosaic applications, appearing to be little more than punctilio, the comma possesses great power. Consider, for the moment, the salutation of a written letter.
That graceful comma is more than ornamentation, more, too, than mere formality. The great missives of history have all begun in such a fashion. But in addition to its magnificent legacy in the history of letter writing, the comma gives us pause to build our anticipation or steel ourselves in preparation. It may tempt us, tickling the foot of that final letter, or it may attempt to hold us back, to warn us before we tumble and fall upon the following line. A comma used thus implies the letter was written with care, with a sensitivity towards its awaiting audience.”
Benjamin Samuel: The Comma From Which My Heart Hangs