@Kyanon same for the citation on Page 29, especially if you think about how did he help others until now.
I mean, it's a teacher's job to show them the way, but they shouldn't get too much into others' affairs because it will backfire sooner or later. That guy who ran away after he heard him shouting should be such example.
Not to mention that Ethics itself has contradictory 'teachings', the easiest one would be the difference between Kant and Rousseau when it comes to human nature. Kant said we are inherently evil and society/laws keeps us from doing evil deeds, while Rousseau said we are good by nature and we didn't know about evil before the first society was formed.
Now, during class it's obvious he will teach both of them but what he says and citates
out of class shows what he believes in... And it's really sad at this point. Someone pointed out in the last chapter that the teacher 'fell way too fast' while in my opinion he didn't fall - we just got to know him better.