A Cat is Always on the Wrong Side of the Door

The cat yowls to come in but once inside, decides that the place he just left is more desirable and proceeds to yowl to get out. There is currently a lot of research concerning hedonistic adaptation. In English, this roughly means that although a change can make us happy at first, we will eventually return to our baseline level of happiness. If we have something pleasant daily, it becomes habitual and taken for granted.
A new job, city or relationship is intoxicating, but the only way to continue enjoying it is to improve our baseline ability to search for and appreciate the benefits our lives currently offer instead of thinking that the proverbial grass would be so much greener if we could kick down the fence and be somewhere else with someone new.   We work so arduously to achieve a goal then quickly forget to value what we’ve gained and have to start all over again, like Sisyphus toiling to push the boulder up the hill only to watch it roll back to the bottom.  
Einstein understood the need to seek magic in the ordinary:  “There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."