While trying to get my head around Augustine’s On Christian Teaching (which isn’t particularly complicated) I’ve been reading the work of some of his influencers. Including Cicero, the great Roman Orator and champion of the Republic. Cicero wrote a book called De Oratore (On the Orators) which you can read in a parallel Latin/English .txt version here. It’s not pleasant to navigate.
He had some good stuff to say about preaching.
“This is why, in those exercises of your own, though there is a value in plenty of extempore speaking, it is still more serviceable to take time for consideration, and to speak better prepared and more carefully. But the chief thing is what, to tell the truth, we do least (for it needs great pains which most of us shirk), — to write as much as possible. The pen is the best and most eminent author and teacher of eloquence, and rightly so. For if an extempore and casual speech is easily beaten by one prepared and thought-out, this latter in turn will assuredly be surpassed by what has been written with care and diligence. The truth is that all the commonplaces, whether furnished by art or by individual talent and wisdom, at any rate such as appertain to the subject of our writing, appear and rush forward as we are searching out and surveying the matter with all our natural acuteness; and all the thoughts and expressions, which are the most brilliant in their several kinds, must needs flow up in succession to the point of our pen ; then too the actual marshalling and arrangement of words is made perfect in the course of writing, in a rhythm and measure proper to oratory as distinct from poetry.
These are the things which in good orators produce applause and admiration; and no man will attain these except by long and large practice in writing, however ardently he may have trained himself in those off-hand declamations; he too who approaches oratory by way of long practice in writing, brings this advantage to his task, that even if he is extemporizing, whatever he may say bears a likeness to the written word; and moreover if ever, during a speech, he has introduced a written note, the rest of his discourse, when he turns away from the writing, will proceed in unchanging style. Just as when a boat is moving at high speed, if the crew rest upon their oars, the craft herself still keeps her way and her run, though the driving force of the oars has ceased, so in an unbroken discourse, when written notes are exhausted, the rest of the speech still maintains a like progress, under the impulse given by the similarity and energy of the written word. ”