I don't remember how it went, but it was at the SeeD graduation party where Quistis tells Squall she aint no teacher anymore:

Squall: Are you done?
Quistis: You don't have to talk, just listen.
Squall: Then go talk to a wall.

Anyone who knows it went excactly (and who can filter out my English errors in this post, I'm dutch) please correct me.