"If you prostrate youself a hundred times in front of a mirror, it never moves from its place. If any ugliness has appeared in the mirror, know that it is your own; do not despise the mirror. Hide the fault that you see on his face from him, because he is my friend. With the tongue of the heart, he says, “Surely, this is not possible.”
Now, O friend, you say, “Place the mirror into my hand so that I may look at it!” Yet I cannot find a pretext for this, nor can I deny your request; but i say in my own heart, “Let me find some pretext not to give you the mirror, because if I say that there is something wrong with your face, perhaps you will not accept it; and if you say that the mirror is defective, this will be worse for you.” Yet love does not allow me to find a pretext. Now I say, “Let me give you the mirror, but if you see some fault on its face, do not blame the mirror, but something reflected onto the mirror. Know that it is your own image; find the fault in yourself! At least don’t look into the mirror while you are near me. The only condition is that you do not find fault with the mirror. If you are unable to find the fault in yourself, at least find fault with me, as i am the owner of the mirror. Don’t say the mirror is defective.”
“I accept the condition. I promise, I cannot wait any longer!” And yet his heart does not accept it....
But finally, after all these words, when he ws given the mirror, he, himself, just ran away. ...
the mirror was rebuking him with the tongue of its own heart: You see? What did I tell you? And what are you doing to me? You love yourself and find fault with the mirror. Because the one who loves his or her own ego respects only the ego, while the one who loves the mirror, gives up both ego and mirror.
The mirror is the Truth, Itself. He thinks the mirror is someone other than himself. The mirror answers anyone who addresses It. Due to the inclination of the mirror, he also has an inclination toward the mirror. If he, on the other hand, had broken the mirror, he would have broken me too. Hasn’t it been said, “I am near to those whose hearts have been broken”? In short, it is impossible for the mirror to bow down and honor itself. It is like a touchstone or a balance; it always inclines toward the Truth."
---from "The Conversations" (Maqalat) of Shams of Tabriz