I saw a good message on a piece of artwork at a show Saturday:

It is good to look at the past, and the future.....
Just don't STARE!
Live Now!

I like that! I think it is beneficial to look at the past; it has made us who we are. And the future is where we want to go or who we want to be. Good things to look at and think about to help us achieve what we want to achieve.