On Duties 3.95 — Cicero (on the Stoics)

Cicero (on the Stoics), On Duties 3.95

And once more; when Agamemnon had vowed to Diana the most beautiful creature born that year within his realm, he was brought to sacrifice Iphigenia; for in that year nothing was born more beautiful than she. He ought to have broken his vow rather than commit so horrible a crime. Promises are, therefore, sometimes not to be kept; and trusts are not always to be restored. Suppose that a person leaves his sword with you when he is in his right mind, and demands it back in a fit of insanity; it would be criminal to restore it to him; it would be your duty not to do so. Again, suppose that a man who has entrusted money to you proposes to make war upon your common country, should you restore the trust? I believe you should not; for you would be acting against the state, which ought to be the dearest thing in the world to you. Thus there are many things which in and of themselves seem morally right, but which under certain circumstances prove to be not morally right: to keep a promise, to abide by an agreement, to restore a trust may, with a change of expediency, cease to be morally right. With this I think I have said enough about those actions which masquerade as expedient under the guise of prudence, while they are really contrary to justice.