Jamieson, Fausset and Brown on Luke 9:55-56

55-56. know not what ... spirit--The thing ye demand, though in keeping with the legal, is unsuited to the genius of the evangelical dispensation. The sparks of unholy indignation would seize readily enough on this example of Elias, though our Lord's rebuke (as is plain from Lu 9:56) is directed to the principle involved rather than the animal heat which doubtless prompted the reference. "It is a golden sentence of Tillotson, Let us never do anything for religion which is contrary to religion" [Webster and Wilkinson].