If there’s one creed that Kingsman service members seem to live by, it’s to always appear polite and well-behaved in front of friends, enemies and everyone else. This poses a particular challenge for Eggsy in the first film, as he grew up in a much fouler environment and was used to swearing like a sailor.
His mentor Harry Hart (Colin Firth) showed Eggsy that a man can be polite yet energetic. Before taking on a bunch of bar flies who messed with Eggsy in the first film, Harry remarks, “Manner makes man” before proceeding to smack the tar out of the whole group. This impresses Eggsy enough to force him to join the Kingsman under Harry’s personal tutelage.
In the second film, Harry says, “Manners maketh man,” before having another bar fight as a callback to the first film, although this time the brawl doesn’t end in his favor. In the prequel film, audiences discover that “Manners maketh man” was a line uttered to main character Orlando Oxford (Ralph Fiennes) by the villainous Captain Morton (Matthew Goode). Orlando then decided to make lineage a founding principle of the Kingsman corporation he would one day found.
https://www.looper.com/1023045/things-that-happen-in-every-kingsman-movie/ Things that happen in every Kingsman film