I’m trying to put this as delicately as I can. How do I know you won’t kill me in my sleep?

Simon: I’m trying to put this as delicately as I can. How do I know you won’t kill me in my sleep?
Mal: You don’t know me, son, so let me explain this to you once. If I ever kill you you’ll be awake. You’ll be facing me. And you’ll be armed.
Simon: Are you always this sentimental?
Mal: I had a good day.
Simon: You had the Alliance on you. Criminals and savages. Half the people on the ship have been shot or wounded including yourself. And you’re harboring known fugitives.
Mal: We’re still flying.
Simon: That’s not much.
Mal: It’s enough.