I've been reading spiritual stuff recently, stuff that says how you think about what happens is what is painful, or cause pain. If we judge a situation as bad, it can cause us distress, frustration, and all the negative emotions, and we long for what we think would be better so we live for the future, not here and now... and the better we think about can be disappointing once it's reality.
If we judge a situation as good, any hint of change can make us feel threatened, we want to cling to what we prefer and this causes us stress. By trying to retain which we have, we live in the past. That's why our thoughts are wrong because they keep us from the present if we attach to much importance to them, if we identify with them.
Of course, it's impossible not to have no such thoughts, it's about seeing them as "wrong" or just not giving them the whole spotlight since they aren't the whole story.
I've recently watched a movie on Nelson Mandela's life, in it he gets asked if he wants to take revenge on the white population for the oppressing he and black people have suffered, he said yes, but that he will not act on this because what he wants more than revenge is peace. He recognized the anger, hatred, and the wish for revenge in himself but he did not let it take all the place in his mind, he kept love and compassion in his thoughts, both toawrds others and himself, which lead him to do great things, that's how his thoughts were wrong, and therefore he was not. It's the easiest thing one can do, but also the most difficult.
It's also why I like putting hearts everywhere, to remind myself the stuff I think wrong is not the whole picture.
This got a little long, ah.