No matter what anyone says or does, my task is to be good. (Hays translation) - Marcus Aurelius

Though thou be destined to live three thousand years and as many myriads besides, yet remember that no man loseth other life than that which he liveth, nor liveth other than that which he loseth.

[...] As for others whose lives are not so ordered, he reminds himself constantly of the characters they exhibit daily and nightly at home and abroad, and of the sort of society they frequent; and the approval of such men, who do not even stand well in their own eyes has no value for him.

Pain is the opposite of strength, and so is anger. (Hays translation)