Keys are the most important object for me, I bring keys everyday, and I can't forget it one day. So I think that I hold keys is the most in my life.
No one doesn't have a key, everyone brings keys everyday. Keys can safe your important things: money, house, cars, your life...whatever you want. If you lost your keys, it means your important things are not safety. So you must need to take care your keys and make sure you can't lost it anytime and carefully to keep it in your life forever.