Begin by prescribing to yourself some character and demeanor, such as you may preserve both alone and in company.
Be mostly silent, or speak merely what is needful, and in few words. We may, however, enter sparingly into discourse sometimes, when occasion calls for it; but let it not run on any of the common subjects, as gladiators, or horse races, or athletic champions, or food, or drink—the vulgar topics of conversation—and especially not on men, so as either to blame, or praise, or make comparisons. If you are able, then, by your own conversation, bring over that of your company to proper subjects; but if you happen to find yourself among strangers, be silent.
Let not your laughter be loud, frequent, or abundant.