Our daily lives are a series of habits which we had formed over a long period of time, sometimes months or even years. Bad habits don't just dissapear, it takes effort, hard work, and commitment on our part to get rid of those habits that do not add any value to the quality of our lives. It works the same way for establishing good habits - it doesn't happen overnight. We should ask ourselves each day how each habit either benefits us or hurts us, and be honest with ourselves.
