To Remember or not to Remember...

Some things you just want to forget about, others you never want to forget. How do you decide which ones to keep and which ones not to? I've always thought of the good memories and thoughts as being comforting and interesting, especially ones that make me laugh. And the useless ones are ones of being angry, annoyed and hurt. Those I have always easily thrown out. Sometimes its good to keep a couple of those, however to remember mistakes made and unkind things needing fixed. Sometimes it's possible to even turn some of the rotten memories into good ones.