How, then, shall one preserve intrepidity and tranquillity; and at the same time be careful, and neither rash nor indolent?
By imitating those who play at tables. The dice are indifferent; the pieces are indifferent. How do I know what will fall out? But it is my business to manage carefully and dexterously whatever doth fall out. Thus in life, too, this is the chief business; distinguish and separate things, and say, "Externals are not in my power, choice is. Where shall I seek good and evil? Within; in what is my own." But in what belongs to others, call nothing good, or evil, or profit, or hurt, or anything of that sort.
EPICTETUS. DISCOURSES. Book ii. §5. ¶1.