Many people spend quality time in front of a mirror to make sure everything is in place before braving it into the public arena.
In a spiritual sense, the Bible, Qur'an etc has the same function of a mirror, but how attentive are we when we compare our spiritual image with the instructions of our Holy Book?
"Do not merely listen to the word, and so deceive yourselves. Do what it says. Anyone who listens to the word but does not do what it says is like someone who looks at his face in a mirror and, after looking at himself, goes away and immediately forgets what he looks like." (James 1:22-24)