[Part of it is because his fatal flaw isn't something he likes to discuss. Part of it is also the author hates us and never said what it is. He trusts the kid more than he trusts anybody else on the ship but it's still one of the subjects he'd rather skirt around, especially when Adam's still talking and Luke's starting to really really wonder about the old Adam Parrish.]

Hey, I did it because I was taking care of other people. [...] Believe it or not I didn't always like using my powers. So don't try that on me. [...but that's putting a lot of things into perspective.]

You've never had it, have you. [He can't judge but Adam being like this...he's actually surprised he didn't go for the money motive.]