"And you would find loyalty and friendship in Hufflepuff, a camaraderie that you have never had before. You would find that you could rely on others, and that would heal something inside you that is broken."
“And will it come by owl?” Lily whispered.
“Normally,” said Snape. ”But you’re Muggle-born, so someone from the school will have to come and explain to your parents.”
“Does it make a difference, being Muggle-born?”
Snape hesitated. His black eyes, eager in the greenish gloom, moved over the pale face, the dark red hair.
“No,” he said. ”It doesn’t make any difference.”
Ultimately there’s an echo of what Lily did, quite a conscience echo, right at the start of the story, at the very end of the story. At the start of the story Lily dies to keep her son alive. At the end of the story Harry lies to be pretending to be dead on the ground and it’s a mother who saves him again because she’s trying to get to her own son. That was closing a circle. He was saved by Lily and saved by Narcissa.
Source
Source
Source
Source