Tim Chester has some quotes on children’s work from “Creature of the Word” (a book that I haven’t read yet).
My father once said that he spent his life as a pastor trying to un-teach what people had learnt in Sunday school. By this he meant that in Sunday school children are typically taught moralism. He then had to un-teach that moralism and replace it with the gospel. This is a theme powerfully expounded in Creature of the Word: