> > ...you think there are the good people and the bad people,” said the man. “You’re wrong, of course. There are, always and only, the bad people, but some of them are on opposite sides.”

A little more highfalutin with Aleksandr Solzhenitsyn in The Gulag Archipelago:

> The line separating good and evil passes not through states, nor between classes, nor between political parties either—but right through every human heart—and through all human hearts. This line shifts. Inside us, it oscillates with the years. And even within hearts overwhelmed by evil, one small bridgehead of good is retained.

* https://www.goodreads.com/quotes/450864-the-line-separating-...