Jamieson, Fausset and Brown on Luke 10:36

36. Which ... was neighbour?--a most dexterous way of putting the question: (1) Turning the question from, "Whom am I to love as my neighbour?" to "Who is the man that shows that love?" (2) Compelling the lawyer to give a reply very different from what he would like--not only condemning his own nation, but those of them who should be the most exemplary. (3) Making him commend one of a deeply hated race. And he does it, but it is almost extorted. For he does not answer, "The Samaritan"--that would have sounded heterodox, heretical--but "He that showed mercy on him." It comes to the same thing, no doubt, but the circumlocution is significant.