Way back when I was a young pastor, I came across a book called “The Art of Plain Talk” by Rudolph Flesch. You might recognize the name Flesch from hearing of the Flesch Kincaid scale for reading levels that is used by speakers, copywriters and others to check the level of their communications. It’s also not a bad thing for preachers to use as well.
I found this book by Rudolph Flesch in a library somewhere. In fact, in my mind, I found a discarded copy, but I don’t have it on me now. It highlighted some of the principles of just talking plainly and clearly.