but does not know they know

[keannu]

1. How does "talk of" from "talk about"? Just stylistic difference?
2. Does this "but does not know they know" mean "things (everyone knows) but (everyone does not know the fact that they(everyone) know)? Like things we are not aware of even though we may know it unconsciously?

9-4)... I believe that writers examine secret wounds inside ourselves, wounds so secret that we are barely aware of them. By understanding these wounds, we are able to make them part of our writing.
A writer talks of things that everyones know but does not know they know. To expore this knowledge, and to watch it grow,

[SoothingDave]

1. The meaning is the same here, basically.
2. Yes. It is the unexamined things the writer examines.