They don't have DISCIPLINE.
They don't have armor.
Game of Thrones Season 1, Episode 5
You don't have the DISCIPLINE.
Game of Thrones Season 3, Episode 7
You didn't get much DISCIPLINE
as a child, did you?
Game of Thrones Season 6, Episode 4
No DISCIPLINE. No training.
Game of Thrones Season 4, Episode 9
Perhaps you need more scribing work
to DISCIPLINE your mind.
Game of Thrones Season 7, Episode 5