This is a quotation from Chekhov's story "Тоска"(See <https://ru.wikisource.org/wiki/%D0%A2%D0%BE%D1%81%D0%BA%D0%B0_(%D0%A7%D0%B5%D1%85%D0%BE%D0%B2)#cite_note-1>). I have googled but couldn't find anything about the meaning of the word "повем".