If you want to understand 98% of the unhappiness in the world — whether it is on the stage of international politics or the stage of your kitchen or bedroom, or wherever your arguments happen—consider the roots of resentment.
By resentment I mean something quite dark within the human heart. This heart of darkness is not just feeling bad because Henry got a bigger piece of pie or Sally called me a bad name. Instead it is the brooding review of a grievance (or a perceived grievance) over…