For if anyone is a hearer of the word and not a doer, he is like a man observing his natural face in a mirror;
for he observes himself, goes away, and immediately forgets what kind of man he was.
But he who looks into the perfect law of liberty and continues in it, and is not a forgetful hearer, but a doer of the work, this one will be blessed in what he does."
James 1:22-25 (NKJV)
Sometimes when I travel, and even when I am just living my life, I see people who look like they have not seen themselves in a mirror lately, and people who do things without realizing how what they are doing looks. Mirrors are not hard to find, and by looking in a mirror and observing ourselves we can be sure that everything about how we look and act is not completely out of the ordinary, it is not something that might look ridiculous, or something that is out of place or offensive to others.
In his letter, James compared God's Word to a mirror, and James went on to say how some people look in a natural mirror, but then go away and forget what kind of person they are. In the same way, some Christians look in the Word of God, but then forget who they are spiritually. God's Word shows us who we really are, what Jesus did for us, and what God wants us to do in life. But if we never look in the mirror of God's Word, how do we know if the way we live our life is really the way that God intended us to live?
The Bible has been given to us to help us, and we all need help in various areas of our life from time to time. We need to live a life based on what God's Word shows us, and not be someone who just looks briefly at what the Bible teaches, and then goes away without making any adjustments. The only way to really know what is good and right is to check what the Word of God says about something. We need to look into the mirror of God's Word to see who we really are, what God has planned for us to do, and then act on that.