In fact, don't look back at all.
I'm not saying that we should obliterate the past and all it was for us, I'm not that mean or miserable. I'm not saying that we shouldn't learn from our mistakes.
I'm saying that what was mean or makes us feel miserable should be left in the past. We are moving on in life and the way to do that best is to keep facing forward.
Don't look back in anger,
Look forward in hope,