I open at the close

I know it's a Harry Potter thing, but I was reminded of this when I finished The Serpent's Shadow by Rick Riordan about 15 minutes ago.

I was completely distraught since I'm pretty sure that's the last book in the series when I remembered what was engraved on the snitch.

"I open at the close" doesn't just mean that the snitch will open when Harry walks calmly into the face if death. But it applied to me when I close that book. I open a new one at the close of an old.

I guess if you wanted to go in depth you could say that it meant that when one door closes in life another opens, but for now I want to stay at the book I'm morning the ending of.