" Repeatedly comparing our situation with that of others is a kind of sickness of the mind that brings much unnecessary discontent and frustration. When we have a new source of enjoyment or a new car, we get excited and feel that we are at the top of our game. But we soon get used to it and our excitement subsides; when a new model comes out we become unhappy with the one we have and feel that we can only be satisfied if we get the new one, especially if other people around us have it. We are caught on the “hedonic treadmill” — a concept coined by P. Brinkman and D. T. Campbell.7 While jogging on a treadmill, we need to keep running simply to remain in the same spot. In this case, we need to keep running toward acquiring more things and new sources of excitement simply to maintain our current level of satisfaction. "

― Matthieu Ricard , Happiness: A Guide to Developing Life's Most Important Skill