On Duties 3.33 — Cicero (on the Stoics)

Cicero (on the Stoics), On Duties 3.33

It is subjects of this sort that I believe Panaetius would have followed up, had not some accident or business interfered with his design. For the elucidation of these very questions there are in his former books rules in plenty, from which one can learn what should be avoided because of its immorality and what does not have to be avoided for the reason that it is not immoral at all. We are now putting the capstone, as it were, upon our structure, which is unfinished, to be sure, but still almost completed; and, as mathematicians make a practice of not demonstrating every proposition, but require that certain axioms be assumed as true, in order more easily to explain their meaning, so, my dear Cicero, I ask you to assume with me, if you can, that nothing is worth the seeking for its own sake except what is morally right. But if Cratippus does not permit this assumption, you will still grant this at least—that what is morally right is the object most worth the seeking for its own sake. Either alternative is sufficient for my purposes; first the one and then the other seems to me the more probable; and, besides these, there no other alternative that seems probable at all.