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.

But there is a means by which this absolutely crucial enquiry can be carried out. Let the young soul look back upon its life and ask itself: what until now have you truly loved, what has drawn out your soul, what has commanded it and at the same time made it happy? Line up these objects of reverence before you, and perhaps by what they are and by their sequence, they will yield you a law, the fundamental law of your true self.

Friedrich Nietzsche