You can be invincible, if you enter into no contest in which it is not in your power to conquer. - Epictetus

Be free from grief not through insensibility like the irrational animals, nor through want of thought like the foolish, but like a man of virtue by having reason as the consolation of grief.

Remember to act always as if you were at a symposium. When the food or drink comes around, reach out and take some politely; if it passes you by don't try to pulling it back. And if it has not reached you yet, don't let your desire run ahead of you, be patient until your turn comes.

"If anyone tells you that a certain person speaks ill of you, do not make excuses about what is said of you but answer, "He was ignorant of my other faults, else he would not have mentioned these alone.