Write to me only once a week, so that your letter arrives on Sunday -- for I cannot endure your daily letters, I am incapable of enduring them. For instance, I answer one of your letters, then lie in bed in apparent calm, but my heart beats through my entire body and is conscious only of you. I belong to you; there is really no other way of expressing it, and that is not strong enough. But for this very reason I don't want to know what you are wearing; it confuses me so much that I cannot deal with life; and that's why I don't want to know that you are fond of me. If I did, how could I, fool that I am, go on sitting in my office, or here at home, instead of leaping onto a train with my eyes shut and opening them only when I am with you? Oh, there is a sad, sad reason for not doing so. To make it short: My health is only just good enough for myself alone, not good enough for marriage, let alone fatherhood. Yet when I read your letter, I feel I could overlook even what cannot possibly be overlooked.
Franz Kafka para Felice Bauer, 1912