Galatians 4: 17-18. “They zealously affect you, but not well; yea, they would exclude you, that ye might affect them. But it is good to be zealously affected always in a good thing, and not only when I am present with you.”
The judaizers had come to make a prey of the Galatian believers with their false teaching, trying to affect them adversely in order that they might rally around the judaizers, because they wanted to set up a little group of their own. They were not seeking the Galatians’ good, but were trying to extend their own influence.
Paul said, “It is good for a man to be zealous in what is right. It is good to go after people with the truth and bring them into the light, and you who started in the truth need to come back to it, even if I am not with you.”
Many years ago, I knew of a situation in which two men had joined a certain church. They were full of brotherly love, it seemed, and soon their wives were teaching in the women’s classes. The men were put in places of authority and responsibility. And then word started coming to the pastor that these men were teaching another gospel; that they were questioning the pastor’s authority to be in ministry (on trumped up charges), and doing their best to run him out and take over the church themselves.
They didn’t succeed, but the church was so damaged by the division and the gossip, by the lies and the hurt and anger, that it never really recovered. Too late, it was discovered that these two men had a history of going to different churches and doing the same thing wherever they went. They were preaching “another gospel,” and doing damage to the cause of Christ.
Just like the judaizers in Galatia.