Why explicitly write “private”?

Question

As fields are implicitly private, why there is often explicit declaraion used in the books, articles etc.?

Answer 1

Explicit declaration used to told you that the variable is deliberately set to private and it needs to be declare as private

Answer 2

In my opinion it makes the code better readable. I don't have to think about the default access modifier. It's also enforced by StyleCop, a tool I use to ensure a consistent coding style.