I like this.
I know you will say to me we can't do this today, we have to find the odd Arian and embrace him. We can't call people Pelagians, 'Porridge eating scumbags' or pultibus Scottorum praegravatus, which is too racist for modern sensibilities to be translated into the vernacular.
St Nicholas is another of those Advent saints who insist on being faithful to the Trinity and Incarnation.
I love the old European custom of St Nicholas going around bishops houses disguised as a small child and demanding to know if they have been good in the past year and if they have giving them presents and they haven't giving them a good thrashing. In the case of bishops 'good' means loyal and faithful and true.
The St Nicholas legends of course unite theology and morality, the Eternal Word becomes flesh so we might hear the Logos speaking directly to us, revealing the Will of the Father to us. That arch villain, the heresiarch Arius wanted to deny to deprive small children of Christmas, to steal their tangerines and toffees. The great and glorious orthodox Bishop Nicholas by defending the doctrine of (ὁμοούσιος) consubstantiation saved children from being butchered and virgins being sold into prostitution. We see this extra-ordinary change happening with the laws enacted by Constantine after Nicea, children and young women, even slaves are given a new dignity in the Imperial Code.
How right the Prefect of the Vatican Congregation of Doctrine of the Faith, Cardinal Gerhard Ludwig Müller, is to say 'the separation of theory and practice of the faith would be the manifestation of a subtle Christological heresy in principle'. Wrong believing leads to wrong living, just the same as wrong living leads to wrong believing. A bishop or priest in mortal sin will always tailor what he preaches to fit his sin.
A Christian cannot live rightly if he doesn't believe rightly, 'show me someone in mortal sin and I will show you an heretic' or as I think Ullathorne or one of his contempories said, 'show me a sinner and I'll show you someone who hasn't learnt his catechism'.