That's not how Chesterton is using it, though; he's using it about the myths and stories that justify a profession: doctors talk about saving lives (rather than making money), soldiers talk about saving the country from vicious greedy foreigners (rather than making money), etc. He regards these myths as ennobling in the best sense: adding meaning to life, a raison d'etre, ikigai etc.; you could read his Napoleon of Notting Hill as an illustration of this idea, especially towards the end.