Sweetness and light
Sweetness and light is an English idiom that today is used in common speech, generally with mild irony, to describe insincere courtesy. For example: The two had been fighting for a month, but around others it was all sweetness and light. Originally, however, "sweetness and light" term had a special use in literary and cultural criticism to mean "pleasing and instructive", which in classical theory was considered to be the aim and justification of poetry.