A positive mindset makes a world of difference in the way we live our life. Accepting the way it is (i.e. the true nature of things) doesn't mean you have to pretend that everything is wonderful and that you are happy all of the time. Rather, it is a willingness or courage to sit with suffering knowing like all things it will eventually pass. By observing the end of suffering you gain personal experience of the fact that nothing that arises in this world is permanent.