IF you go and revile your brother, I tell you you have forgot who you are, and what is your name. For even if you were a smith and made an ill use of the hammer, you would have forgot the smith: and, if you have forgot the brother, and are become, instead of a brother, an enemy do you imagine you have made no change of one thing for another in that case? If, instead of a man, a gentle social creature, you are become a wild beast, mischievous, insidious, biting; have you lost nothing? But must you lose money, in order to suffer damage; and is there no other thing, the loss of which damages a man? If you were to part with your skill in grammar, or in music, would you think the loss of these damage? But if you part with honour, decency, and gentleness, do you think that no matter?
EPICTETUS. DISCOURSES. Book ii. §10. ¶4