The underlined sentence is a good topic sentence. Job satisfaction is an essential factor for job hunting. Firstly, a person needs to feel that they are doing valued and valuable work, so positive feedback from superiors is very important in this respect. Secondly, when someone feels they are improving or developing their skills through training opportunities, for example, then there is a sense of progression and purpose that rewards a worker. Satisfaction is also increased by a sense of responsibility for and loyalty to a team.