" Rosalie was right about one thing, though. When Bella said the word forever, it didn't mean the same thing to her as it meant to me. For her, it meant merely a very long time. It meant she couldn't see the end yet. How could anyone who had lived only seventeen years comprehend what fifty years meant, let alone eternity? She was human, not a frozen immortal. Within just a few years, she would reinvent herself many times over. Her priorities would shift as her world grew wider. The things she wanted now wouldn't be the things she wanted then. "

― Stephenie Meyer , Midnight Sun