This premise behind this non-fiction book by Oliver Burkeman is that you cannot achieve happiness by ignoring the negative. You must become at peace with the fact that bad things happen all the time. In fact, most things are neutral. How we react to them makes them good or bad. So if you have a negative reaction to something it is probably because you encountered an unexpected result. You should ask yourself why do you have such a strong attachment to a certain outcome? That expectation and attachment is the underlying cause of your unhappiness. Simple, right?
Burkeman draws heavily from the Greek Stoics and Buddhism. If you were ever interested in what Stoicism or Buddhism is about, then read the Antidote which is an easy and entertaining introduction to some of the main principles.