My job performance, productivity, and quality of work are all inextricably tied to my state of mind. When I feel good about my job and my co-workers, when I feel that I'm doing the best work I can do and being recognized for that, then I feel good about my job. My passion and commitment for my profession and the work I do translates to a passion and commitment to the job.
When these things happen, I have high "work esteem". I care.