Moral Letters to Lucilius Section 74

Tunc adpetita formidant et quae illos graves aliis reddit, gravior ipsis felicitas incubat. Tunc laudant otium lene et sui iuris, odio est fulgor et fuga a rebus adhuc stantibus quaeritur. Tunc demum videas philosophantis metu et aegrae fortunae sana consilia. Nam quasi ista inter se contraria sint, bona fortuna et mens bona, ita melius in malis sapimus; secunda rectum auferunt. Vale.

et cette même fortune qui les fait peser sur autrui leur pèse à eux, bien plus accablante ; alors ils font l’éloge d’une douce et indépendante retraite : ils abhorrent l’éclat, ils cherchent par où fuir de l’édifice encore debout : alors enfin vous
voyez la crainte philosopher et des affaires malades inspirer de saines résolutions. Car, comme si c'étaient choses incompatibles que bonne fortune et bon esprit, le malheur nous donne la sagesse que la prospérité emporte.

Then they fear that for which they strove, and the good fortune which made them weighty in the eyes of others weighs more heavily upon themselves. Then they praise easy leisure and independence; they hate the glamour and try to escape while their fortunes are still unimpaired. Then at last you may see them studying philosophy amid their fear, and hunting sound advice when their fortunes go awry. For these two things are, as it were, at opposite poles - good fortune and good sense; that is why we are wiser when in the midst of adversity. It is prosperity that takes away righteousness. Farewell.