When someone looks at himself in the mirror, he sees who he looks like. The mirror reveals to him what his look at the moment is. Such a person is expected to use the knowledge which he has gathered by observing himself in the mirror to know how to manage himself. The knowledge which he has gathered will make him adjust his outfits in order to look the way he wants to look like.
Those who forget what they look like are called self deceivers. These people are deceiving themselves because they can't tell themselves the truth about who they really are. They have forgotten what the mirror told them about their outlook.
People who only hear the word of God without putting into practice the things which they have learned from the Bible are like people who forget what their outlook resembles. We should be doers of the Word not only hearers. For the Word God to profit us, we must not forget what manner of person which the word says we are.
As we hear His word, we should also be doers of the word
We should hear, listen and do the Word of God
We should be doers of the Word