In the area of morality, the common way is to go with the flow, if you will. Whatever the current climate of the culture says is ok and acceptable and good the common way is to follow that flow. Have sexual relations before marriage? "Hey, 'that's hip'," forget the emotional connections left hurting, the selfish fleshly desire that only seeks its own gratification, 'do what thou wilt.' That's the common way. Go ahead and cheat on those tax forms, the Govt has enough money they won't notice. Whatever feels good do it, whatever is right in your own eyes do it. This is the common way.
The uncommon way is to live our life unto our Savior. No matter what the current culture calls acceptable, we live the standards Jesus set. Love God and love others and ourselves. If we love others we won't seek our own sexual gratification at the expense of our purity and the purity of the other. We won't give ourselves away without the loving commitment of the covenant of marriage. The uncommon way is to trust God as our source. We don't look to cheat or defraud anyone or any Govt entity.
In summation, defining holiness as uncommon is the best way to understand the behavioral aspect of the Gospel. Does behavior matter? Yes for two reasons. One, we want to honor the Finished Work with the way we live. Second, we want others to be drawn to this amazing Good News of Jesus Christ. How He loves us, accepts us and approves us and how He gives life its purpose and value and meaning. Look how Paul plainly shows the common way versus the uncommon.
Paul is saying don't walk as the others walk. In other words, don't live commonly. Live uncommonly, this is the life God has created you for. Live out of the New Creation reality. Live out who He already made you in the Finished Work.
Holiness is not a position we achieve. It is not something we pursue or strive to become. It's not cosmetic free women who also are forbidden to cut their hair, or people not wearing jewelry, or people not owning a Television or enjoying entertainment. It's not defined as doing something or abstaining from something in order to become. It's living life being loved by the Savior and living out of the New Creation. It's maturing into who He already made you. It's living uncommonly. It's be holy, or in other words be you, the New you, He perfectly recreated in the Finished Work.
Let me leave you with one last passage to solidify this truth;