Recently i finished this really great book called The happiness Hypothesis and it helped me educate myself on the topic of how we ruminate more negativity in our brains. It was something like if you think negativity enough all you will have ruminating in your head is negativity.
And but of course, if you carry too much ambivalence it can't result in a good outcome and maybe this is obvious to majority perhaps but it was astonishing to me. It really shows the power processing thoughts has over us.