James and John had great zeal, but initially lacked eloquence and wisdom. Similarly, we need God to redirect our efforts to His purpose rather than our own.
In Mark 3:16-19, Jesus calls the disciples. He gives the brothers James and John a nickname, or title, "Boanerges," which is Greek for "Sons of Thunder."
James and John do not appear to have been selfish, but men of action ready to meet a challenge.
God's truth may bring about sadness, astonishment, anger, and bitterness to the one delivering the message. James and John were types of the Two Witnesses.
The Scriptures are largely silent about the exploits of the apostles other than Paul. We have only general comments concerning their spheres of activities.
The first major concern of the Two Witnesses will be directed to the church rather than to the world at large, expunging worldliness out of the church.