Answer:
I suppose that because everyone’s life has not the exact same conditions as the other’s, so we need to find our particular way to move in the world. This if we talk in radical terms, disregarding the cultural compromises and models that habitually people carry on that are relatively succesful and enough for them, even if they get a bit angry, depressed, or desire for something new from time to time. They accept this contradictions as normal (“life sucks!”). Some other people cannot tolerate even mild contradictions in their life, crave for a peaceful wholly integrated and free of conflicts personality and believe your statement.
