"People will screw you over. They will screw you hard. But, you know what? It’s okay. Think about when you were five and someone stole your toy or did something awful to you. Can’t recall a moment like this? Exactly. Life goes on." - Pat Pace I read an interesting article about memories and how when we recall a memory we are just recalling the last time we thought of that memory and thus the memory is distorted. http://www.themarysue.com/memory-distortion-in-brain/
Think about this. It is really true. All of us are guilty at some time or another of living in the past. But, what past are we really living in? Generally it is the most strongest emotion we experience in that moment. That is why Cognitive Behavioral Therapy (CBT) works so well. Basically with CBT we are re-training our brains to see that moment differently.
Living in the past holds us back from living in the moment. As martial artists, yesterday is an illusion and there is no tomorrow. If we won't let go of the yesterday, how can we swim towards a better tomorrow?