As long as you honour material things, direct your anger at yourself rather than the thief or adulterer. - Epictetus

It is the act of an ill-instructed man to blame others for his own bad condition; it is the act of one who has begun to be instructed, to lay the blame on himself; and of one whose instruction is completed, neither to blame another, nor himself. (5) [tr. George Long (1888)].

فلتبدأ من أصغر الأشياء: انسكَبَ شيءٌ من الزيت؟ سُرِق النبيذ؟ قل: «هذا ثمنُ خُلوِّ البال وصفاء النفس، ولكلِّ شيء ثمن.» إذا ناديتَ خادمك، فاذكر أنَّه قد لا يُجيبك. وإذا أجابك فقد لا يُنفِّذ ما تريده. غير أنه ليس من السطوة بحيث يكون بمقدور مثله أن يعكِّر صفوك.

Work, therefore to be able to say to every harsh appearance, “You are but an appearance, and not absolutely the thing you appear to be.” And then examine it by those rules which you have, and first, and chiefly, by this: whether it concerns the things which are in our own control, or those which are not; and, if it concerns anything not in our control, be prepared to say that it is nothing to you.