May be kinda specific (and poorly worded), but basically she said that negative feelings come from places where my mental image of the world conflicts with objective reality. This was mostly related to my relationship with my father, as i was looking up to him and seeking his approval, while ignoring the fact that neither he should be a role model or i can be a person whom he would accept. I found this advice applicable to many other situations, but unfortunately i mostly use it after the fact — i get disappointed or angry about something and then i ask myself “Ok, but what i imagined things would be? What else am i wrong about?”