"Is that what it is though?" Jack asked, honest and curious. "Justice? Or is that just what we're calling it to... make it sound okay. We're good together, Doctor. We work well together. But if we fell... if we fell together. We're dangerous. What we feel is dangerous. Anger and guilt and regret and loneliness. It's dangerous. We need to make sure that's not what we're doing. Not some sort of... retribution. Righting our wrongs. Because sometimes I sit and I think actually it sounds like a pretty good idea. Pretty sure the TARDIS even got me killed once to stop me thinking it. Just... no justice. Not yet. Not for a while. Nothing. Just... travelling. We just need that."