Moral Letters to Lucilius Section 9

Naturalia desideria finita sunt; ex falsa opinione nascentia ubi desinant, non habent. Nullus enim terminus falso est. Viam eunti aliquid extremum est; error inmensus est. Retrahe ergo te a vanis, et cum voles scire, quod petes, utrum naturalem habeat an caecam cupiditatem, considera, num possit alicubi consistere. Si longe progresso semper aliquid longius restat, scito id naturale non esse. Vale.

car point de limites dans le faux. Qui suit la vraie route arrive à un but ; qui la perd s’égare indéfiniment. Retire-toi donc de l’illusoire, et quand tu voudras savoir si ton désir est naturel ou suggéré par l’aveugle passion, vois s’il a quelque part son point d’arrêt. Quand, parvenu déjà loin, toujours il lui reste à pousser au delà, sache qu’il est hors de la nature.

Natural desires are limited; but those which spring from false opinion can have no stopping-point. The false has no limits. When you are travelling on a road, there must be an end; but when astray, your wanderings are limitless. Recall your steps, therefore, from idle things, and when you would know whether that which you seek is based upon a natural or upon a misleading desire, consider whether it can stop at any definite point. If you find, after having travelled far, that there is a more distant goal always in view, you may be sure that this condition is contrary to nature. Farewell.