Katara:  Why would you even try to defend him ?
Toph: Because , Katara , you 're all ignoring one crucial fact ... Aang needs a Firebending teacher . We ca n't think of a single person in the world to do the job . Now _ one _ shows up on a silver platter and you wo n't even think about ?
Aang: I 'm not having Zuko as a teacher .
Sokka: You 're darn right you 're not , buddy .
Katara: Well , I guess that 's settled .
Toph: I 'm beginning to wonder who 's really the blind one around here .