" How can man know himself? He is a dark and veiled thing; and whereas the hare has seven skins, the human being can shed seven times 70 skins and still not be able to say: ‘This is really you, this is no longer an outer shell. Besides, it is an agonizing, dangerous undertaking to dig down into yourself in this way, to force your way by the shortest route down the shaft of your own being. How easy it is to do damage to yourself that no doctor can heal. And moreover, why should it be necessary, since everything – our friendships and hatreds, the way we look, our handshakes, the things we remember and forget, our books, our handwriting – bears witness to our being. "

― Friedrich Nietzsche , Untimely Meditations