bones s06e16

Brennan: I'm... quite strong.
Booth: Yeah, well, you've always been strong.
Brennan: You know the difference between strength and imperviousness, right?
Booth: Well, not if you're going to get all scientific on me.
Brennan: Well, a substance that is impervious to damage doesn't need to be strong.
Booth: Hmm.
Brennan: When you and I met. I was an impervious substance. Now I'm a strong substance.
Booth: I think I know what you mean.
Brennan: A time could come when you aren't angry any more and I'm strong enough to risk losing the last of my imperviousness. Maybe then we could try to be together.