That is true. If you are not interested in what you are doing your lack of care or effort with surely show. Although, some people might just have that sorry kind of luck to have something come along their paths that are unexpected and are effective enough to have an impact on their work ethics. Life has its own balance with positive and negative- Some have it worse than others. In the end, no matter what does happen, if you are determined to succeed, you WILL make it happen. If at first you don't succeed, try, try and try again.