[Sentimentality serves no purpose for a scientist.]

Want something? No. There's no "catch", as you put it. We're all here together, aren't we? And quite frankly, I doubt there's anything I want that those here could give me.

[Even if he does want something, he isn't going to ask for it.]

No no, what I want is something to occupy my time. In that, my work is its own reward. But then, it so often is.