Basically & briefly to say , it's about the negative emotions we have.
Just to name a few : hatred, jealousy, guilt, and fear.
All these negative emotions, we should express out and not keeping it to ourself.
Because as we keeping it to ourself, it would sounds like a volcano is keeping it's
magma and it will burst in 1 shot. The more magma it had, the worse it will be.
Express it out, by crying, eating, writing or whatever you want it to be.
However, there is one thing, one thing which can solve most of the matter.
Forgive.
It's about forgiving others and yourselves.
It may not change the past, but it makes a different in the future.
Watch this video. You may not agree with me , but it's okay.
There is 1 phrase which you might not understand :
All that what we are is the result of what we have thought.
-Buddha
I know . . The Secret.