The various scenes and situations that Jesus discusses in his Discourse on the Hill are actually stages in a progression toward a life of agape love. They progressively presuppose that we know where our well-being really lies, that we have laid aside anger and obsessive desire, that we do not try to mislead people to get our way, and so on. Then loving and helping those who hurt us and hate us, for example, will come as a natural progression. Doing so will seem quite right, and we will be able to do so.
