When Viserys asks whether or not the khal favored his sister, Illyrio replies: "If he did not like her, we'd know." I believe it does. The idiom says to only do matters whenever you need them done and also to not do factors when you are unsure about needing them https://felixrticp.blogsumer.com/34357168/not-known-factual-statements-about-games-for-free