Quotations about:
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There are such things as to speak well, to speak easily, to speak correctly, and to speak seasonably. We offend against the last way of speaking if we mention a sumptuous entertainment we have just been present at before people who have not had enough to eat; if we boast of our good health before invalids; if we talk of our riches, our income, and our fine furniture to a man who has not so much as an income or a dwelling; in a word, if we speak of our prosperity before people who are wretched; such a conversation is too much for them, and the comparison which they then make between their condition and ours is very painful.

[Il y a parler bien, parler aisément, parler juste, parler à propos. C’est pécher contre ce dernier genre que de s’étendre sur un repas magnifique que l’on vient de faire, devant des gens qui sont réduits à épargner leur pain; de dire merveilles de sa santé devant des infirmes; d’entretenir de ses richesses, de ses revenus et de ses ameublements un homme qui n’a ni rentes ni domicile; en un mot, de parler de son bonheur devant des misérables: cette conversation est trop forte pour eux, et la comparaison qu’ils font alors de leur état au vôtre est odieuse.]

Jean de La Bruyère (1645-1696) French essayist, moralist

The Characters [Les Caractères], ch. 5 “Of Society and Conversation [De la Société et de la Conversation],” § 23 (5.23) (1688) [tr. Van Laun (1885)]
    (Source)

(Source (French)). Alternate translations:

Some men talk well, easily, justly, and to the purpose: those offend in the last kind, who speak of the Banquets they are to be at, before such as are reduc'd to spare their Bread; of sound Limbs, before the Infirm; of Demesnes and Revenues, before the Poor and Needy; of fine Houses and Furniture, before such as have neither Dwelling or Moveables: in a word, who speak of Prosperity, before the Miserable. This conversation is too strong for 'em, and the comparison you make between their condition and yours is odious.
[Bullord ed. (1696)]

There is speaking well, speaking easily, speaking justly, and speaking seasonably: 'Tis transgressing the last rule, to speak ofthe sumptuous Entertainments you have made, before such as are reduc'd to want of Bread; of a healthy Constitution of Body, before the Infirm; of Demesnes, Revenues and Furniture, before a Man who has neither Dwelling, Rents, nor Movables; in a word, to speak of your Prosperity before the Miserable: this Conversation is too strong from them, and the Comparison they make between their Condition and yours is odious.
[Curll ed. (1713)]

There is speaking well, speaking easily, speaking justly, and speaking seasonably: It is offending against the last, to speak of Entertainments before the Indigent; of sound Limbs and Health before the Infirm; of Houses and Lands before one who has not so much as a Dwelling; in a Word, to speak of your Prosperity before the Miserable; this Conversation is cruel, and the Comparison which naturally rises in them betwixt their Condition and yours is excruciating.
[Browne ed. (1752)]

There is a difference between speaking well, speaking easily, speaking with judgement and speaking opportunely. We fail in this last respect when we enlarge upon the splendid meal we have just enjoyed in front of people who have to be thrifty of their bread; or boast of our health in the presence of invalids; or talk about our wealth, our fortune and property to a man who has neither home nor income; in a word, when we speak of our happiness in front of those who are wretched; such conversation is too painful for them, and the comparison they are bound to make between your state and their own is intolerable.
[tr. Stewart (1970)]