Wonderful fact to reflect upon, that every human creature is constituted to be that profound secret and mystery to every other. A solemn consideration, when I enter a great city by night, that every one of those darkly clustered houses encloses its own secret; that every room in every one of them encloses its own secret; that every beating heart in the hundreds of thousands of breasts there, is, if some of its imaginings, a secret to the heart nearest it! Something of the awfulness, even of Death itself, is referable to this. - Charles Dickens, A Tale of Two Cities