Saul chose to persecute the church of God (Galatians 1:13) which caused great hesitancy on the part of believers to accept Saul after he was converted to Christ. When the Lord spoke to Ananias, Ananias reminded the Lord of Saul’s past endeavours as well as Saul’s “present mission.” The Lord had to reassure Ananias that all was well, and that Saul (changed to Paul) was a chosen vessel to be used of God. When Paul began preaching Christ, many were amazed because they knew Paul as “he that destroyed them which called on this name” (Acts 9:21). When Paul “was come to Jerusalem, he assayed to join himself to the disciples: but they were all afraid of him, and believed not that he was a disciple” (Acts 9:26). Some sinners dig such a mighty deep pit for themselves that only the grace of God and the wisdom of the believers can overcome.
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.