“Let us notice, secondly, in these verses, the extraordinary conduct of two of the apostles, James and John.
We are told that a certain Samaritan village refused to show hospitality to our Lord. ‘They did not receive him, because his face was as though he would go to Jerusalem.’ (Luke 9:53)
And then we read of a strange proposal which James and John made. ‘They said, Lord, wilt thou that we command fire to come down from heaven and consume them, even as Elijah did?’ (Luke 9:54)
Here was zeal indeed, and zeal of a most plausible kind,—zeal for the honor of Christ! Here was zeal, justified and supported by a scriptural example, and that the example of no less a prophet than Elijah!
But it was not a zeal according to knowledge. The two disciples, in their heat, forgot that circumstances alter cases, and that the same action which may be right and justifiable at one time, may be wrong and unjustifiable at another.
They forgot that punishments should always be proportioned to offences, and that to destroy a whole village of ignorant people for a single act of discourtesy, would have been both unjust and cruel.
In short, the proposal of James and John was a wrong and inconsiderate one. They meant well, but they greatly erred.
Facts like this in the Gospels are carefully recorded for our learning. Let us see to it that we mark them well, and treasure them up in our minds.
It is possible to have much zeal for Christ, and yet to exhibit it in most unholy and unchristian ways.
It is possible to mean well and have good intentions, and yet to make most grievous mistakes in our actions.
It is possible to fancy that we have Scripture on our side, and to support our conduct by scriptural quotations, and yet to commit serious errors.
It is as clear as daylight, from this and other cases related in the Bible, that it is not enough to be zealous and well-meaning.
Very grave faults are frequently committed with good intentions. From no quarter perhaps has the Church received so much injury as from ignorant but well-meaning men.
We must seek to have knowledge as well as zeal. Zeal without knowledge is an army without a general, and a ship without a rudder.
We must pray that we may understand how to make a right application of Scripture. The Word is no doubt ‘a light to our feet, and a lantern to our path.’
But it must be the Word rightly handled, and properly applied.”
–J.C. Ryle, Expository Thoughts on Luke (Carlisle, PA: Banner of Truth, 1858/2012), 1: 254-255. Ryle is commenting on Luke 9:51-56.