According to Susan Cain (Quiet: The Power of Introverts in a World That Can’t Stop Talking, 86),  Kafka wrote that  “writing means revealing oneself to excess, that utmost of self-revelation and surrender, in which a human being , when involved with others, would feel he was losing himself , and from which, therefore, he will always shrink so long as he is  in his right mind….That is why one can never be alone enough when one writes, why there can never be enough silence around one when one writes, why night is not night enough.”