"Villem Craven: I ask him, "Vladimir, who knows I do this for you?" "Only Mikhel, a very little," he said. "Mikhel is my friend. But even to friends, we cannot trust." "Enemies I do not fear," he said, "but friends, I fear greatly.""
January 1, 1970
https://en.wikiquote.org/wiki/Smiley's_People_(TV_miniseries)