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Erasmus, Desiderius · 1575

do these expressions apply: "I dissolve in laughter," "I burst," "I am dying of laughter"? To the foolish, whose reason has been absorbed by their emotions.
XXX.
With what expression should cheerfulness be expressed? In such a way that the habit of the mouth is not dishonored, nor the mind judged to be undisciplined.
XXXI.
What should be done if something ridiculous happens, to the point that laughter cannot be held back? It will be a mark of civility to cover the face with a handkerchief or hand, and to laugh modestly, not effusively.
XXXII.
Is it fitting to laugh without any evident cause? Not at all. But if something of that sort should arise, the cause for laughter should be revealed: if it is not suitable to be spoken aloud, something fabricated should be brought forward, so that you do not appear to be mocking anyone.
XXXIII.
Why is it not fitting to lick the edges of the lips repeatedly with the tongue? Because that is the gesture of the inept and those not well-mannered, and it is more suitable for dogs and cats than for noble boys.