dove

“If you want to improve, be content to be thought foolish and stupid with regard to external things. Don't wish to be thought to know anything; and even if you appear to be somebody important to others, distrust yourself. For, it is difficult to both keep your faculty of choice in a state conformable to nature, and at the same time acquire external things. But while you are careful about the one, you must of necessity neglect the other”
― Epictetus

“Whatever this is that I am, it is flesh and a little spirit and an intelligence. Throw away your books; stop letting yourself be distracted. That is not allowed. Instead, as if you were dying right now, despise your flesh. A mess of blood, pieces of bone, a woven tangle of nerves, veins, arteries. Consider what the spirit is: air, and ever the same air, but vomited out and gulped in again every instant. Finally, the intelligence. Think of it this way: You are an old man. Stop allowing your mind to be a slave, to be jerked about by selfish impulses, to kick against fate and the present, and to mistrust the future.”
― Marcus Aurelius, Meditations

“When therefore we are hindered, or disturbed, or grieved, let us never attribute it to others, but to ourselves; that is, to our own principles. An uninstructed person will lay the fault of his own bad condition upon others. Someone just starting instruction will lay the fault on himself. Some who is perfectly instructed will place blame neither on others nor on himself.”
― Epictetus, The Enchiridion

“When you wake up in the morning, tell yourself: the people I deal with today will be meddling, ungrateful, arrogant, dishonest, jealous and surly. They are like this because they can't tell good from evil. But I have seen the beauty of good, and the ugliness of evil, and have recognized that the wrongdoer has a nature related to my own - not of the same blood and birth, but the same mind, and possessing a share of the divine. And so none of them can hurt me. No one can implicate me in ugliness. Nor can I feel angry at my relative, or hate him. We were born to work together like feet, hands and eyes, like the two rows of teeth, upper and lower. To obstruct each other is unnatural. To feel anger at someone, to turn your back on him: these are unnatural.”
― Marcus Aurelius, Meditations