wanting correction and treatment for my character - feedback is a gift. the sooner we accept this concept, the sooner we achieve improvement and progression.
not to be diverted ... anything like that - in this section, i like to summarize all of this advice into a few words: don't be a pompous ass. the urban dictionary does a good 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.
you should be humble; don't think of yourself as so special. no one likes those kinds of people. rather, be down-to-earth, level-headed.
write letters in an unaffected style - similar to the above idea, one should write plainly, should speak plainly, succinctly and to the point.
readily recalled to conciliation ... turn back - similar to the teaching of jesus found in matthew 5:25, we should maintain good and healthy relationships with all people. if something is broken, we should fix it quickly.
to read carefully ... views of others - in other words, don't jump to conclusions. use sound reason and logic. study it out carefully. my senior high school english teacher mr. puckett loved to say "don't assume, because it will make an ass out of u and me.
epictetus - yes, read epictetus, just as much as you read marcus aurelius.