Who Is the Good Samaritan?

Despite the collapse or erasure of Christian references in Europe, contemporary language has retained a certain number of expressions that everyone still understands, at least to some extent. I believe there is no one who doesn't know (or at least intuit) that "the Good Samaritan" is someone who voluntarily aids someone who needs help, with this additional note: that he agrees to depart from his path, or to leave what he was doing, in order to care for someone unfortunate, when nothing obliges him to do so. It is therefore quite natural that Pope Francis gives the parable of the Good Samaritan a place of honor in his recent encyclical on fraternity and social friendship, Fratelli Tutti.