14. In writing or speaking, give to every person his due title,
according to his degree and the custom of the place.
15. Undertake not to teach another in the art which he professes: it
savors of arrogancy.
16. When a person does all he can, do not blame him, though he does not
succeed.
17. Being about to advise or reprehend any one, consider whether it
ought to be done in public or in private, presently or at some other
time, in what terms to do it; and in reproving, show no signs of
choler, but do it with mildness.