I've always thought that the more keys you carry, the heavier your burden is, but is seems to be otherwise with me. When I carried more keys, things were more abundant. There was the key to my desk drawer at work, showing I got a paycheck, and there were keys to my car. Those were the days. Now I carry my own house keyes, a mailbox key, a key to my friend's apartment, and a key to my mom's apartment. I need more locks to open, it seems. No Pandora's box, but something simple yet fulfilling.
I remember having a diary when I was a kid, and it had a lock and key. Something you could easily open with a bobby pin, but seemingly safe to a child.