There is a difference between
the true and blessed hearer of God's Word, and the person who misses the blessing because he hears to forget.
He does not purpose to remember.
He does no listen intently
to "get" God's message and obey it.
He is content to sit in the pew
as if he is fulfilling his Sunday obligation to worship,
and nothing more.
He is fooling himself if he thinks his behavior will profit him anything.
Regarding the Looking glass:
To every hearer the true Word of God is a looking glass, a mirror.
Scripture gives us a true reflection of our nature, (even though we often think it is talking to and about our neighbor and not us).
The looking glass of the Word
is not like any other looking-glass,
which merely shows you your external features.
God's looking-glass shows your true nature.
When you read and hear the Word you may not only see your actions there,
but your motives, your desires, your inward condition is revealed plain before your eyes.
In contrast to the person who sees himself but doesn't really see who he really is,
the other hearer does see himself
in the mirrow of God's Word.
He is thoughtful and welcoming of God's truth,because he is confident it alone is what he needs,
he realizes God's truth applies to him.
He spies out the application of what God's Word is saying and quickly embraces it, ready to apply it and make the necessary changes.
God says this person is blessed because he is "not a forgetful hearer, but a doer of the work."
May God bless this to your heart.