Change the Dalek's mind forever
The Doctor: You need to get up there, find that moment and reawaken it.
The Doctor: Yes, you. Good idea.
The Doctor: I haven't the foggiest. Do a clever thing and then once you have done it, the Dalek will be suggestible to new ideas. It will be open again and I will show it something that will change it's mind forever!
Journey Blue: What?
The Doctor: Not a clue.