1.  He thinks that the same kind of work limit his that thought and emanation , but different jobs will give him different knowledge and they will help him do better than others.

2.  Because they like the new condition, and they want to learn different knowledge.

3.  Because they think that by this means they can get much different knowledge in different fields.

4.  I want to go in for a job forever, I think although the society is changing fastly and we should learn different knowledge, we can do it to adapt the society in our spare time, and as long as I work in a some field, I can become a skilled expert and can do the work more freely and efficiently .

5.  Reading extensively will also help you get more background knowledge During extensive reading, you will come across all kinds of subjects, and different subject offers you different knowledge .