I mean it, really.

I've never forgotten your generous act that day when someone so brutally killed my dog Mike, how you tried to save him.

I didn't know you then, but that made no difference to you.

And now when you find an opportunity to help save a man's life, you never flinch." "Why, it's the natural thing to do." "Is it?
I was beginning to think selfishness was the natural thing," he said, with a hard, twisted smile.
She rested her hand on his sleeve for an instant.

A smile and a shake of her head accompanied the action.
"I know better than that, Lee Bryant," she rejoined.