Arrogance, the inherent arrogance of the Slytherin pure-blood family.
Prejudice, there is no bad wizard who does not come from the prejudice of Slytherin.
When arrogance is melted little by little, when prejudice is reversed little by little, the spark between the two young people is the key to breaking arrogance and prejudice.
(There is no wizard who later turns evil who does not come from the words Slytherin. In the original book, it was said by Hagrid, but in the movie it was changed to Ron. In order to facilitate the advancement of the plot, this article will be regarded as being said by Ron)
Principle: Pride and prejudice are the weaknesses of human nature; pride will make people unable to accept different viewpoints, and prejudice will make people ignore the advantages of others. When facing relationships, perhaps letting go of arrogance and prejudice and feeling each other with your heart is the secret to a long-lasting relationship.