'The girl,' says he, 'is a pearl and a diamond,' and, well, of course, he's 'unworthy of her'; it's their way of talking; but on account of some sins or circumstances 'he is obliged to lead her to the altar, and go to Switzerland, and therefore abandon everything and fly to save me.' Do you understand anything of all that?
However...

however, I notice from the expression of your faces"-- (he turned about with the letter in his hand looking with an innocent smile into the faces of the company)--"that, as usual, I seem to have put my foot in it through my stupid way of being open, or, as Nikolay Vsyevolodovitch says, 'being in a hurry.' I thought, of course, that we were all friends here, that is, your friends, Stepan Trofimovitch, your friends.

I am really a stranger, and I see...

and I see that you all know something, and that just that something I don't know." He still went on looking about him.
"So Stepan Trofimovitch wrote to you that he was getting married for the 'sins of another committed in Switzerland,' and that you were to fly here 'to save him,' in those very words ?" said Varvara Petrovna, addressing him suddenly.

Her face was yellow and distorted, and her lips were twitching.
"Well, you see, if there's anything I've not understood," said Pyotr Stepanovitch, as though in alarm, talking more quickly than ever, "it's his fault, of course, for writing like that.