(Here is, for your perusal, Saint Thomas' teaching on charity - or divine-like love, 'willing the good' - is the principle of merit, rather than, as Kant would later say, the difficulty or greatness...
(I may write more on the recent headline, which comes not as a surprise, that most 'Catholics' - and one must use that term widely nowadays - reject the Church's teaching on 'cohabitation', companionate...
Thomas Aquinas, Summa theologica Question 168, Article 4.
Whether there is a sin in lack of mirth?
I answer that, In human affairs whatever is against reason is a sin. Now it is against reason for a man to...