Could you not give me some sign, or tell me something about you that never changes, or some other way to know you, or thing to know you by?" — "No, Curdie: that would be to keep you from knowing me. You must know me in quite another way from that. It would not be the least use to you or me either if I were to make you know me in that way. It would be but to know the sign of me — not to know me myself.

George MacDonald: an anthology (ed. 1990)