long ago, I enrolled for a diploma in music & had a teacher who was very strict, I missed classes on purpose sometimes just to avoid getting scolded for genuine mistakes. 
I actually got to see the kind of person she was behind the teacher in her, only after the course ended & it altered how I saw her all those years.

took me back to my school days. to a music teacher who for reasons still unknown to me made me sing (i never liked listening to my voice) and even learn the harmonium. he was one of a kind.