In "Biblical Perspective" Dr. Gordon Snider writes,

It should be remembered that the point of the story was to define the term “neighbor.” The priest and Levite were presented as being the most likely to treat the wounded man as a neighbor, but they did not. Then came an unlikely candidate, a certain Samaritan. As he journeyed suggests that his journey was more extensive than just a commute from Jerusalem to Jericho. As a result he was likely more equipped to help, but also under greater time constraints. He also saw him, the same verb used of the priest and Levite. But instead of responding with apathy, the Samaritan had compassion on him. He was deeply moved in his inner being by the plight of the wounded traveler. The same verb was used often by Matthew and Mark to describe Jesus’ response to situations of need. (See Matt. 9:36 and Mark 1:41 for examples.)

Discussion: What would you say it means to be a neighbor?
Source: Biblical Family Values, Adult Teacher's Insights, pages 35-36.