Cautiously avoid talking of either your own or other people’s domestic affairs. Yours are nothing to them but tedious; theirs are nothing to you. The subject is a tender one: and it is odds but that you touch somebody or other’s sore place: for, in this case, there is no trusting to specious appearances; which may be, and often are, so contrary to the real situations of things, between men and their wives, parents and their children, seeming friends, etc., that, with the best intentions in the world, one often blunders disagreeably.

Remember that the wit, humor, and jokes, of most mixed companies are local. They thrive in that particular soil, but will not often bear transplanting. Every company is differently circumstanced, has its particular cant and jargon; which may give occasion to wit and mirth within that circle, but would seem flat and insipid in any other, and therefore will not bear repeating. Nothing makes a man look sillier than a pleasantry not relished or not understood; and if he meets with a profound silence when he expected a general applause, or, what is worse, if he is desired to explain the bon mot, his awkward and embarrassed situation is easier imagined’ than described. ‘A propos’ of repeating; take great care never to repeat (I do not mean here the pleasantries) in one company what you hear in another. Things, seemingly indifferent, may, by circulation, have much graver consequences than you would imagine. Besides, there is a general tacit trust in conversation, by which a man is obliged not to report anything out of it, though he is not immediately enjoined to secrecy. A retailer of this kind is sure to draw himself into a thousand scrapes and discussions, and to be shyly and uncomfortably received wherever he goes.

The PG Edition of Chesterfield’s Letters to His Son — Part 92

You will find, in most good company, some people who only keep their place there by a contemptible title enough; these are what we call VERY GOOD-NATURED FELLOWS, and the French, ‘bons diables’. The truth is, they are people without any parts or fancy, and who, having no will of their own, readily assent to, concur in, and applaud, whatever is said or done in the company; and adopt, with the same alacrity, the most virtuous or the most criminal, the wisest or the silliest scheme, that happens to be entertained by the majority of the company. This foolish, and often criminal complaisance flows from a foolish cause,--the want of any other merit. I hope that you will hold your place in company by a nobler tenure, and that you will hold it (you can bear a quibble, I believe, yet) ‘in capite’. Have a will and an opinion of your own, and adhere to them steadily; but then do it with good humor, good-breeding, and (if you have it) with urbanity; for you have not yet heard enough either to preach or censure.

The PG Edition of Chesterfield’s Letters to His Son — Part 92