The perfect law of liberty is the word of God. A mirror gives you an exact picture of what you look like. A mirror tells the truth. Sometimes, we can see the truth in a picture also. The bible gives us that also. One of the most important things to build into our Christian life is reading the bible on a regular basis. It is good to read it early in the morning with a prayerful thought of what would God have for us. In the evening, do the same thing. It is good to have prayer that God would help us to see his will. And it is so important to be a doer of what He shows you.
“But be ye doers of the word, and not hearers only, deceiving your own selves. For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass: For he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was. But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.” James 1:22-25