Nothing could be less worthy of you than to think anything worse than dishonor, infamous behavior, and wickedness. To escape these, any pain is not so much as to be avoided as to be sought voluntarily, undergone, and welcomed.

[Quid enim minus est dignum quam tibi peius quicquam videri dedecore flagitio turpitudine? Quae ut effugias, quis est non modo recusandus, sed non ultro adpetendus subeundus excipiendus dolor?]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

Tusculan Disputations [Tusculanae Disputationes], Book 2, ch. 5 (2.5) / sec. 14 [Marcus] (45 BC) [tr. Douglas (1990)]
    (Source)

Original Latin. Alternate translations:

For what is more unsuitable to that high Character, than for you to think any thing worse, than dishonour, scandal, baseness? to avoid which, what Pain would not only not be declin'd, but also be eagerly pursu'd, undergone, encounter'd?
[tr. Wase (1643)]

For what is so unbecoming? What can appear worse to you, than disgrace, wickedness, immorality? To avoid which, what pain should we not only not refuse, but willingly take on ourselves?
[tr. Main (1824)]

For what is less worthy than for anything to appear worse to you than disgrace, turpitude, wickedness? which to escape, what pain is to be refused, or rather not to be welcomed, sought for, embraced?
[tr. Otis (1839)]

For what is so unbecoming -- what can appear worse to you, than disgrace, wickedness, immorality? To avoid which, what pain is there which we ought not (I will not say to avoid shirking, but even) of our own accord to encounter, and undergo, and even to court?
[tr. Yonge (1853)]

For what is more unworthy than that anything should seem to you worse than disgrace, crime, baseness? To escape these what pain should be not only not shunned, but voluntarily sought, endured, welcomed?
[tr. Peabody (1886)]

There is nothing more unworthy than for you to think anything worse than disgrace, criminal behavior, and infamous conduct. In order to escape these, any pain is not so to be rejected, as to be actively sought out, undergone, welcomed.
[tr. Davie (2017)]