Know When to Fold 'Em is a trope about knowing when to quit. The page image is basically a Motivator image of two children playing football. I don't see how that has anything at all to do with the trope.
From Gintama, would the second to last panel here with the last panel here and panel 1 and 2 here work well?
(Sudden forum herald pm for my first post in this section since the forum herald thing surprised me. -irrelevant-)