Harry Potter scene that's cool on rewatching it w/awareness of the ending

I was rewatching Half Blood Prince recently and I realized how cool this scene was in retrospect. Snape is talking to Bellatrix and Malfoy’s mom:

“Over the years I’ve played my part well, so well I’ve deceived one of the greatest wizards of all time.”

He then says that Dumbledore is a great wizard and only a fool would question it, but if you think about it, he’s talking about Valdemort when he says the first part! Heh.

Any other lines or scenes along those lines?

Remus statements about Lilly in POA. She was kind and saw good in people.