" (Swann’s illness was the same that had killed his mother, who had been attacked by it at precisely the age which he had now reached. Our existences are in truth, owing to heredity, as full of cabalistic ciphers, of horoscopic castings as if there really were sorcerers in the world. And just as there is a certain duration of life for humanity in general, so there is one for families in particular, that is to say, in any one family, for the members of it who resemble one another. "

― Marcel Proust , In Search of Lost Time