I would argue that the best summation of Christian ethics is found in the sermon on the plain in Luke 6:20–49. What I love about the sermon on the plain is just how radical it seems on the surface, it seems almost impossible; however, when you think about what it’s saying, and think about it deeply—it makes sense. Probably my favorite example of this is found in Luke 6:34–35 (NRSV):
If you lend to those from whom you hope to receive, what credit is that to you? Even sinners lend to sinners, to receive as much again. But love your enemies, do good, and lend, expecting nothing in return. Your reward will be great, and you will be children of the Most High; for he is kind to the ungrateful and the wicked.