”Of course he’s a good man,” Sin spoke without hesitation. “Do you think he would use the name “Doctor” if he wasn’t a good man? You know, Tenny saved my life. He saves lives all the time, and does what’s best for everyone. He doesn’t carry a weapon— he carries a screwdriver. Y’know why? So he can fix what’s broken. The Doctor is a hero. And if he wasn’t a good man, I wouldn’t travel with him. But you know what David? I think you should judge his character for yourself. You can’t believe everything that people tell you about someone. You gotta decide for yourself who’s good and who’s bad. Do you think Tenny is bad?”
"Ronoa said he calls himself the Doctor because he was so bad that the old time lord society told him he no longer has the right to use his birth name. I know his real name and I would have changed it too. It’s ugly.” He stopped mentioning Ronoa when Sin said he should decide for himself. “He’s never been bad to me. He gave me the cookies I ate today and on my birthday last year he brought me to see Albert Einstein because he knew I liked him a lot. And, and…and when those bad people attacked the house he looked for me and made sure I was safe. He also helped save Ronoa’s children, Celebus and Luna.” He nodded. “That’s what good men do, right?”
"But…in the history books they write bad things about him. He destroyed his Gallifrey and killed…did genocide. Bad men do that but he isn’t a bad man to me."