The most important thing of all in dialogue is not the text at all, but the subtext. That’s where the deeper meaning is conveyed. You’re not looking at what the characters are saying, you’re looking at the meaning behind the words.
Understanding subtext… is one of the most difficult areas of writing, but one of the most important….
Readers get the most from a story if they’re reading its subtext.
– David Roach via @WritersRoomMag