Moral Letters to Lucilius Section 58

Causa his quae iactationis est? Quod nihil liquet incertissimo regimine utentibus, fama. Si vis eadem semper velle, vera oportet velis. Ad verum sine decretis non pervenitur; continent vitam. Bona et mala, honesta et turpia, iusta et iniusta, pia et impia, virtutes ususque virtutum, rerum commodarum possessio, existimatio ac dignitas, valitudo, vires, forma, sagacitas sensuum; haec omnia aestimatorem desiderant. Scire liceat, quanti quidque in censum deferendum sit.

La cause de cette mobilité est toujours l’éblouissement que nous cause le phare le moins sûr de tous, l’opinion. Pour vouloir toujours les mêmes choses, il faut vouloir le vrai. On n’arrive point au vrai sans les dogmes : toute la vie est là. Biens et maux, honnête et déshonnête, juste et injuste, actes pieux et impies, vertus et usages des vertus, avantages de la vie, considération, dignité, santé, force, beauté, sagacité des sens, toutes ces choses veulent un bon appréciateur. Que l’on puisse savoir pour combien chacune doit entrer dans nos ressources.

And what is the reason for this tossing to and fro? It is because nothing is clear to them, because they make use of a most unsure criterion - rumour. If you would always desire the same things, you must desire the truth. But one cannot attain the truth without doctrines; for doctrines embrace the whole of life. Things good and evil, honourable and disgraceful, just and unjust, dutiful and undutiful, the virtues and their practice, the possession of comforts, worth and respect, health, strength, beauty, keenness of the senses - all these qualities call for one who is able to appraise them. One should be allowed to know at what value every object is to be rated on the list;