You just never knew.

That was the thing. You just never knew. Forever was so many different things. It was always changing, it was what everything was really all about. It was twenty minutes, or a hundred years, or just this instant, or any instant I wished would last and last. But there was one truth about forever that really mattered, and that was this: it was happening, right then, and every moment afterwards.

Sarah Dessen, The Truth about Forever.