I am reading in Leviticus this morning and God is explaining through Moses the different sacrifices and how to perform them the right way. In Chapter 10, Moses says to Aaron in verses 10-11, "You must distinguish between the holy and the common, between the unclean and the clean, and you must teach the Israelites all the decrees the Lord has given them through Moses."
It was the responsibility of the priest to make this determination in his own life and then to communicate that to the rest of the people. With the gift of the Holy Spirit through baptism in the New Testament, we are all now charged with the same duties as priests for the King. We are to push away from what is common and unclean and instead live a life that is marked by uncommon holiness. It is a spiritual separation from the world by the power of the Holy Spirit within us, and a physical separation in attitude, thoughts, words and actions that reveals to the rest of the world who our true Master is. It then falls on all believers to teach that truth from God as it is revealed by our earnest searching for what is right.
Don't settle for commonplace. That isn't the lifestyle that Christ paid the price for us to have.