Devil: Sam, if I can impart to you one piece of knowledge, just one kernel of truth that I've gleaned over the entirety of my existence, it would be this. Betrayal is the defining trait of humanity. Your friends will always let you down. The girl will always leave.
Sam: That's not true.
Devil: Yes it is. And your so-called friends have proven my point. You know, you're not angry at Leon. You're just upset because you're realizing the weakness of your species. The most untrustworthy, unreliable creatures on this Earth... Except for bears