Kafka's love letter to Felice

In November of 1912, three months after he met Felice, Kafka writes:

Fräulein 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?

Whether out of self-protective rationalization or mere pragmatism — the onset of tuberculosis was, after all, what ended the relationship five years later — he plaintively points to a physiological reason, almost as an excuse for the psychological:

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.

He resumes his plea, which seems directed more at himself than at her:

If only I had mailed Saturday’s letter, in which I implored you never to write to me again, and in which I gave a similar promise. Oh God, what prevented me from sending that letter? All would be well. But is a peaceful solution possible now? Would it help if we wrote to each other only once a week? No, if my suffering could be cured by such means it would not be serious. And already I foresee that I shan’t be able to endure even the Sunday letters. And so, to compensate for Saturday’s lost opportunity, I ask you with what energy remains to me at the end of this letter…

He closes in true Kafkaesque fashion:

If we value our lives, let us abandon it all… I am forever fettered to myself, that’s what I am, and that’s what I must try to live with.