Kafka: it confuses me so much that I cannot deal with life

Fraulein Felice!
I am now going to ask you a favor which sounds quite crazy, and which I should regard as such, were I the one to receive the letter. It is also the very greatest test that even the kindest person could be put to. Well, this is it:
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?

• Franz Kafka writing to Felice Bauer in 1912, Letters to Felice