If there is one creed the Kingsman service members seem to live by, it is to always appear polite and well-behaved in front of friends, enemies, and everyone else. This proves particularly challenging to Eggsy in the first movie, since he grew up in much more foul-mouthed surroundings and was used to cursing like a sailor.
His mentor, Harry Hart (Colin Firth), showed Eggsy that a man can be polite and still forceful. Before taking on a bunch of bar flies who were messing with Eggsy in the first movie, Harry remarks, “Manners maketh man,” before proceeding to beat the tar out of the whole group. This impresses Eggsy enough to compel him to join the Kingsman under Harry’s personal tutelage.
In the second movie, Harry says, “Manners maketh man,” before another bar fight as a callback to the first film, although this time the brawl does not end in his favor. In the prequel movie, audiences discover that “Manners maketh man” was a line uttered by the villainous Captain Morton (Matthew Goode) to the lead character Orlando Oxford (Ralph Fiennes). Orlando then decided to make the line a founding principle of the Kingsman society he would one day create.