Once again I have told you so little, and have asked no questions, and once...

Once again I have told you so little, and have asked no questions, and once again I must close. But not a single answer and, even more certainly, not a single question shall be lost. There exists some kind of sorcery by which two people, without seeing each other, without talking to each other, can at least discover the greater part about each other's past, literally in a flash, without having to tell each other all and everything; but this, after all, is almost an instrument of Black Magic {without seeming to be} which, although never without reward, one would certainly never resort to with impunity. Therefore I won't say it, unless you guess it first. It is terribly short, like all magic formulas. Farewell, and let me reinforce this greeting by lingering over your hand.
Yours, Franz K.