A quote for you that I heard today.
"Fight for the present and not for the past."
I feel like this can mean so many things. It could be twisted and turned. For me I believe it says to not dwell on the bad things that have happened in the past. Don't fight with others or yourself over things that may have already happened. It could be it with a relationship or a job, or something else. By no means forget it, but you can not change it. The past is the past. Learn from it without letting the worry dwell on it and plan for the future.
Fight for the good things of the present. It is the time we have control over.