Dear Arthur,

Thank you for writing this letter to me. I can see that you are a better  friend than I expected. I just dont understand  why Mr Digby-Vane-Trumpington went to your room in the middle of the night! I also think that offering 20 pounds is very INSULTING! and I think that is more insulting because he was responsible.Please dont accept the money because is very little compared to my disgrace. 

About the question that you asked me, I think that teachers need to explain to the students how to self-control because when the kids grow up and they have problems in different contexts, they will know what to do.

Regards, 

Paul Pennyfeather