Comment by hitekker

Giving a few good examples also has the benefit of demonstrating the author's own understanding. If the author can't describe the matter in different ways, it shows don't have a feel for "it", and they're not grasping it rightly or even touching it at all. I've found that audiences can sense when a speaker is out-of-touch, and will politely ignore them.

Separately, I've heard that the Nicene Creed and its ancillaries had the repetitions hardcoded to forestall natural schism/emergent mutations in the generational belief system.