When I was younger i didn't care particularly. I just treated people well and expected the same in return. I tried to be fair and honest in my dealings and I tried to do good work because I had pride in my self and my work.Then, when i got older, I learned that i had a reputation for being all the above which boosted the pride in self and the desire to do well by others. I had earned the reputation and now I know that it matters what what others think because it effects how I think and how I do.
Simple I suppose, but factual.
Don