Mark records it, translates it, and never says why. What we do have is three incidents, and two lives that ended nothing like each other.
The sons of thunder are James and John, the sons of Zebedee. Jesus gives them the name in Mark 3:17, where the Aramaic is Boanerges and Mark translates it for his readers.
Mark does not say why. The nickname is never explained, anywhere. What we have instead is a set of episodes involving these two brothers that make it fairly easy to guess.
The interesting part is not the nickname. It is what happens to these two men afterwards, and what Jesus does with the thing He apparently named them for.
Matthew and Luke both list the twelve and neither mentions the name. Mark keeps it and then translates it, which he does for details he wants his Greek readers to catch.
Mark 3:16 has Simon renamed Peter, the rock, in the same breath. Renaming is a deliberate act in Scripture, and it usually says something about a calling.
Associated with the voice of God at Sinai and in the Psalms. It is not only a word for volume. It is a word for something you cannot ignore.
We do not know whether it was a description of their temperament, a commission about what they would become, or affectionate teasing. All three have been argued.
An unexplained nickname, preserved by one gospel, given at the same moment Simon becomes Peter. Whatever it is, it is not throwaway.
Three incidents involve them specifically, and all three point the same direction.
Luke 9:54. A village will not receive Jesus, and the brothers ask, Lord, do you want us to call fire down from heaven to destroy them. That is the request, in full.
Mark 10:35. Let one of us sit at your right and the other at your left in your glory. Asked immediately after Jesus predicted His own death for the third time.
Mark 9:38. John tells Jesus they stopped a man driving out demons in His name, because he was not one of us. That is the stated reason.
Certainty, escalation and an instinct to close ranks. Not cowardice, not indifference. Energy pointed in the wrong direction.
One honest footnote. Some manuscripts of Luke 9:55 add that Jesus said you do not know what kind of spirit you are of. The line is absent from the earliest copies and most modern Bibles put it in a note. It is a fair summary of the scene either way, and it is not certain that Luke wrote it.
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Manage My Giving"Each of you should give what you have decided in your heart to give, not reluctantly or under compulsion, for God loves a cheerful giver."2 Corinthians 9:7
This is the part that makes the nickname worth a page, because the two brothers end up in completely different places and the thunder is in both.
Acts 12:2. Put to death with the sword by Herod, the first of the twelve to be killed. One verse, no details. He asked to sit at Jesus's right hand and Jesus had asked whether he could drink the cup.
Tradition has him outliving all of them. What survives from him is a gospel about love and three letters in which the word appears constantly. Beloved, let us love one another.
Sit with that for a second. The man who wanted to incinerate a Samaritan village is the one who wrote that everyone who loves has been born of God, and that anyone who claims to love God while hating a brother is a liar.
Nothing in the record says he became mild. He is still absolute, still certain, still drawing hard lines. The lines are just drawn around a different thing.
Church culture often treats intensity as a flaw to be smoothed out, and treats a calm temperament as a spiritual achievement rather than a personality. We think that is wrong and this pair is the argument against it.
Jesus does not ask James and John to become quieter people. He does not suggest their problem is that they feel too strongly. He rebukes what they are aiming at, repeatedly and directly, and then keeps them in the inner three.
Discipleship as gradually turning everybody into the same mild, agreeable person. Intensity as something to apologise for.
The same force, pointed somewhere else. John's letters are not calm. They are the most uncompromising documents in the New Testament, and the subject is love.
This is not a permission slip. Every one of the three incidents gets corrected on the spot, and none of the corrections is gentle. Wanting to destroy people who reject Jesus is rebuked. Wanting status is answered with a flat contradiction: Matt Skinner sums up Jesus's reply that “greatness among Jesus' followers is measured by their ability to live as servants and slaves”. Gatekeeping who is allowed to minister is shut down with do not stop him.
So the honest version is not that your temper is fine as it is. It is that Jesus works with what you are made of rather than replacing it, and that the working involves being corrected more than once about where you are pointing it.
Why does Jesus call James and John the sons of thunder?
Mark 3:17 gives the Aramaic Boanerges and translates it, then moves on. The usual guess comes from three later incidents involving the brothers, but the nickname itself is never explained.
The sequence in Mark 3 is worth noticing. Jesus calls them, names them sons of thunder, and puts them in the twelve. All of that happens before any of the incidents that make the nickname make sense.
He knew. He named it out loud, apparently with some humour, and then chose them anyway and took them up the mountain at the Transfiguration and into the garden at Gethsemane.
That order matters if you are waiting to be less of a problem before you are useful. The calling came first, the correction came later and more than once, and the thing they were named for turned out to be the thing they were needed for.
One of them died for it early. The other spent sixty years writing about love with the same intensity he once wanted to burn a village with. Neither of those is a quiet ending.
For related ground, see the twelve disciples, how the apostles died, who wrote the book of John, the Samaritans, the Transfiguration and agape love.
Only Mark records the nickname and nobody explains it, the brothers earn it three times over, and Jesus corrected where the thunder was pointed without ever asking them to stop being loud.
Plenty of people have been quietly taught that their temperament is a spiritual problem. Send it here and somebody at Sound of Heaven will pray over it with you.
James and John, the sons of Zebedee. Jesus gives them the name in Mark 3:17, where the Aramaic is Boanerges and Mark translates it for his readers. Only Mark records it. Matthew and Luke both list the twelve and neither mentions the name, and no gospel ever explains why Jesus chose it.
Scripture never says. The usual guess comes from three later incidents. In Luke 9:54 the brothers ask whether they should call fire down from heaven on a Samaritan village that would not receive Jesus. In Mark 10:35 they ask for the seats at His right and left, immediately after He predicted His death for the third time. In Mark 9:38 John reports stopping a man driving out demons because he was not one of us.
James was put to death with the sword by Herod in Acts 12:2, the first of the twelve to be killed, reported in a single verse. John by tradition outlived all of them, and what survives from him is a gospel about love and three letters where the word appears constantly. The man who wanted to incinerate a village wrote that anyone who claims to love God while hating a brother is a liar.
He never asks them to feel less. He rebukes what they are aiming at, three times and not gently, and then keeps them in the inner three and takes them up the mountain at the Transfiguration. John's letters are not calm documents. They are the most uncompromising writing in the New Testament, and the subject is love. The force was redirected rather than removed.
Some manuscripts add that Jesus said you do not know what kind of spirit you are of. The clause is absent from the earliest copies, and most modern Bibles put it in a footnote. It is a fair summary of the scene either way, but it is not certain that Luke wrote it, and it is worth knowing that before quoting it.