Something I wrote a couple of years ago readers may find useful. Here are John Henry Newman’s rules for writing sermons, which I would commend because I’ve read Newman and you’re probably (no offense) no Newman. They appear in the second volume of Wilfrid Ward’s The Life of John Henry Cardinal Newman.
1. A man should be in earnest, by which I mean he should write not for the sake of writing, but to bring out his thoughts.
2. He should never aim at being eloquent.
3. He should keep his idea in view, and should write sentences over and over again till he has expressed his meaning accurately, forcibly, and in few words.
4. He should aim at being understood by his hearers or readers.
5. He should use words which are likely to be understood. Ornament and amplification will come spontaneously in due time, but he should never seek them.
6. He must creep before he can fly, by which I mean that humility, which is a great Christian virtue, has a place in literary composition.
7. He who is ambitious will never write well, but he who tries to say simply what he feels, what religion demands, what faith teaches, what the Gospel promises, will be eloquent without intending it, and will write better English than if he made a study of English literature.
Update: For Newman’s understanding of how Catholics should treat the pope, see Defend Him Against All Hazards.