Learn to ask of all actions, 'Why are they doing that?' Starting with your own. - Marcus Aurelius

If thou art pained by any external thing, it is not this that disturbs thee, but thy own judgment about it. And it is in thy power to wipe out this judgment now.

Words that everyone once used are now obsolete, and so are the men whose names were once on everyone's lips: Camillus, Caeso, Volesus, Dentatus, and to a lesser degree Scipio and Cato, and yes, even Augustus, Hadrian, and Antoninus are less spoken of now than they were in their own days. For all things fade away, become the stuff of legend, and are soon buried in oblivion. Mind you, this is true only for those who blazed once like bright stars in the firmament, but for the rest, as soon as a few clods of earth cover their corpses, they are 'out of sight, out of mind.' In the end, what would you gain from everlasting remembrance? Absolutely nothing. So what is left worth living for? This alone: justice in thought, goodness in action, speech that cannot deceive, and a disposition glad of whatever comes, welcoming it as necessary, as familiar, as flowing from the same source and fountain as yourself.

I can control my thoughts as necessary; then how can I be troubled? What is outside my mind means nothing to it.