I think reading and writing is about communicating. When you
write you have a responsibility to convey your thoughts and
feelings succinctly and unambiguously. When you read you have to
get the message and the intent exactly as the author wanted.
And to be able to write something one needs to have the
knowledge which can be put into thoughts and can be written so that
someone could read it.
Also when you write something meaningful for someone to read,it
should be able to make the reader also think and reflect upon what
is written and use that knowledge in further understanding.