Why is being generous important ?

Being generous is so important because it will come back to you later on in life. If you're mean to someone that might come back to you negatively.

B. nothing more cruel

In the excerpt the speaker describes Granny Weatherall being left at the alter as the cruelest thing a person can do. This shows that the main character has refused to let go of her past because she compares all other cruelties to her jilting and still feels that nothing is worse. Blew out the light and no sign could indicate that she has moved on