Why wouldn't a real Christian enjoy living like the world?
A true believer would not enjoy the world's lifestyle because grace is not a license to sin; rather, they have entirely different desires. The average true believer would be as miserable in a honky tonk on Saturday night as a regular honky tonk customer would be in church on Sunday morning. Two totally different lifestyles and desires.
Les explains that grace is not licensed, so it does not mean a believer can go out and live like the devil's crowd. The reason is that the true believer simply does not want to. He illustrates that the average true believer would be as miserable in a honky tonk on Saturday night as a regular honky tonk customer would be miserable in church on Sunday morning. It is the same difference: two totally different lifestyles and two totally different desires. This contrast is what makes it work.