Imagine how awful it must be for Severus Snape to have to teach Harry Potter when Harry has his mother’e eyes (Snape was in love with Lily) and looks like his dad (Snape hated James Potter).
You’re stuck looking at the beautiful eyes of your (long-dead) beloved which reside in the face of the bloke you hated most at school.
Also, how does Harry not remember Snape cradling Lily’s body after Voldemort’s attack on the Potters? He was in the same room, and you can’t really forget someone like Snape! Surely that adds to Harry’s traumatic memories?
” ‘You are speaking of London, I am speaking of the nation at large.’
‘The metropolis, I imagine, is a pretty fair sample of the rest.’
‘Not, I should hope, of the proportion of virtue to vice throughout the kingdom. We do not look in great cities for our best morality. It is not there, that respectable people of any denomination can do most good; and it certainly is not there, that the influence of the clergy can be most felt. A fine preacher is followed and admired; but it is not in fine preaching only that a good clergyman will be useful in his parish and his neighbourhood, where the parish and neighbourhood are of a size capable of knowing his private character, and observing his general conduct, which in London can rarely be the case. The clergy are lost there in the crowds of their parishioners. They are known to the largest part only as preachers.’ “
- “Mansfield Park” by Jane Austen