Why does the Church keep explaining the same thing?

The Church does not repeat out of a lack of ideas. She returns time and again to what is essential because the human heart needs clarity, formation, and conversion. Each era has its confusions. That is why the faith must be explained in understandable language, without losing its content or watering down the truth. The Church keeps explaining because each era formulates new questions. Guarding the same truth also demands knowing how to show how it illuminates concrete situations.