Believers are not to speak, look, think, or act like the world. In every way possible, believers are to remain separate and distinct. Believers saved for any length of time have noticed the drastic shift in what the world defines as acceptable and unacceptable behaviour. For instance, man in general once disdained the idea of tattoos, body piercings, and cuttings in the flesh (Leviticus 19:28). Yet, now these things are not only acceptable but even practiced by believers. The world used to distinguish between men and women, even taking note of one’s hair length (1 Corinthians 11:14-15). Yet these distinctions have been blurred and in some cases eliminated with men attempting to become women and women men. The people of God are not to follow along with cultural shifts, but abide rather in the unchangeable words of God.
A zealous person is contagious, both positively and negatively. The apostle Paul cautioned that the early believers had been zealously affected, but not in a good way. Those who opposed the gospel were adamant, yet they unwisely waged war against the truth. Night and day, they zealously fought in order to hinder the ministry of the believers. Ultimately, their zeal affected the people of God. These believers who started strong were hindered by the enemies' efforts to the point that it affected their race for the Lord (Galatians 5:7). Modern day enemies of the gospel are aware of this potential pitfall for the believers. They often display more zeal than those who knowingly possess the truth. Yet, today's passage also teaches that “it is good to be zealously affected always in a good thing.” Zeal breeds zeal. Zeal in righteousness will yield righteous results.