Aurelius, Meditations §aur_08_iv: What they have done, they will still do, although thou shouldst hang thyself.

What they have done, they will still do, although thou shouldst hang thyself. First; let it not trouble thee. For all things both good and evil: come to pass according to the nature and general condition of the universe, and within a very little while, all things will be at an end; no man will be remembered: as now of Africanus (for example) and Augustus it is already come to pass. Then secondly; fix thy mind upon the thing itself; look into it, and remembering thyself, that thou art bound nevertheless to be a good man, and what it is that thy nature requireth of thee as thou art a man, be not diverted from what thou art about, and speak that which seemeth unto thee most just: only speak it kindly, modestly, and without hypocrisy.