It is not about striving for immortality, but about accepting mortality.

“Dumbledore raised his finger for silence, a silence which fell as though he had…”

“I believe your friends Misters Fred and George Weasley were responsible for try…”

“Third - to Mr. Harry Potter,' said Dumbledore. The room went deadly quiet. '...…”

“In the end, it mattered not that you could not close your mind. It was your hea…”