In "Sonnet 18," what does the poem say about the importance of writing?

Shakespeare compares his loved one to a summer’s day and
other beautiful aspects of nature. He categorizes objections to nature’s beauty in favor
of enduring depictions of the one he loves. The summer day eventually ends and summer
eventually leads to fall, winter and unharmonious weather. The speaker transitions from
objections to nature to his praise of his loved one. She (or he) does not have an
earthly immortality. But writing allows the possibility of immortality. The speaker
writes to preserve the memory of his loved one and this kind of immortality endures as
long as there are others to read.

readability="8">

So long as men can breathe or eyes can
see,

So long lives this and this gives life to
thee.

The loved one lives on
in the sonnet. Summer fades, the sun dims and humans are mortal. But writing is an art
form that preserves memory indefinitely, or as long as humans and reading/writing exist.
This idea of immortality through writing is almost as old as writing itself. The idea of
writing is to represent, communicate and preserve meaning.