Tomorrow is National Punctuation Day, and to mark that auspicious occasion, Mr. John E. McIntyre, who plies his trade at the Baltimore Sun, has a few things say today about the lowly comma. Please follow the link to the complete (short) article; however, there is one paragraph I’d like to highlight (emphasis added):
But the comma may also be used in places where it is not grammatically required. Writers of fiction in particular use it to indicate the pauses in speech. It may also be freely used to indicate emphasis, with less intensity than a dash. And the preceding sentence is an example of that use.
Tomorrow, look for another post here on writing dialogue. Consider that to be a tease.