To want correction and treatment for my character means that Marcus learned to appreciate feedback as a gift. The sooner we accept this concept; the sooner we achieve improvement and progression. Some may not like getting feedback simply because of the way it was delivered. But if regardless of how it is delivered, a person can always learn to appreciate advice in order to improve.
To not to be diverted by a taste for rhetoric might be modernized into a plain-speaking translation of (quote) don't be a pompous ass (close quote). The urban dictionary does a fine job defining what a pompous ass is: a person who seems full of themselves and who grabs every opportunity to let others know of their feelings of superiority. More importantly, the aim of philosophy is to live it, not write about it. Indeed, writing can help ingrain ideas in your mind, but this is a means to an end. The end is to live a good life.
When you do write letters, do so in an unaffected style. You should write and speak plainly, succinctly and to the point.
Next, Marcus learns to be readily recalled to conciliation. This is similar to the teaching of Jesus found in Matthew 5:25, where he teaches settle matters quickly and fix relationships before, they become too damaged. We should maintain good and healthy relationships with all people. If something is broken, we should fix it quickly.
When it comes to reading, we should read carefully. We should avoid jumping to conclusions and use sound reason and logic. My senior high school English teacher, Mr. Puckett, loved to say, "don't assume, because it will make an ass out of you and me.”
Marcus read and studied Epictetus and so should you!