No words in the Torah are better known than "love your neighbor as yourself" (Leviticus 19:18), and no words are generally seen as more significant. And yet for all its manifest centrality in Jewish spirituality and ethics, the precise meaning of the verse is actually quite elusive. What does it mean to "love" your neighbor? Does the Torah command our emotions as well as our actions? Given emotions can't be controlled, can they even be commanded at all? Rav Shai argues that they can.