You cannot think about things that people have done wrong by you because that will achieve nothing. Thinking about what anyone else has done with a negative context is wasteful. Typically I think I'm going to gain something, some feeling of satisfaction or be at one with which ever topic it is I'm pondering, but time and time again this proves to not be the case. You just dwell on the situation and achieve nothing.

The moment is now, the power is now, when you dwell on these bullshit thoughts that don't matter, you lose the moment and everything that could have been enjoyed with that moment, because you're stuck in your own head. it's passed, it's gone and that's not going to change. You can't be concerned with what was, what would have been, what could have been; it doesn't matter. It's not here now, this is what's happening right now, stay in the moment.