Each weapon tested on someone who deserved it.

I might have had just a bit of Jet before operating. So I nipped a few arteries I shouldn't have? Who hasn't?

Good patients get a nice, new face. Bad patients bleed all over the floor because they want to screw up their surgeon's life!

Even at the worst of times, things aren't so bad when you're around, sir/mum.

The thing about happiness is that you only know you had it when it's gone. I mean, you may think to yourself that you're happy.
But you don't really believe it. You focus on the pretty bullshit, or the next job, or whatever.
It's only looking back by comparison with what comes after that you really understand, that's what happiness felt like.