LEV727 (Continued from [[NUM300]] Numbers 27:16 spirits DORFFDRAG 52-3). These classical rabbinic sources also indicate that pluralism is a divine creation; human beings have difficulty imitating it. To achieve the ability to be pluralistic is, in fact, the ultimate ethical and spiritual challenge, according to [Rabbi Simon] Greenberg [1986, “Pluralism and Jewish Education” Religious Education 81 (winter): 19-28. Just as “love your neighbor as yourself” -- which, for Rabbi Akiva, is the underlying principle of all the commandments (Sifra to Leviticus 19:18) -- requires a person to go beyond biologically rooted self-love, pluralism requires a person to escape egocentricity. It is not possible for human beings totally to love their neighbors as themselves, and neither is it possible to be totally pluralistic; we are by nature too self-centered fully to achieve either goal. The tradition, however, prescribes methods to bring us closer to these aims. Many of its directions to gain love of neighbor appear in that same chapter 19 of Leviticus in which the commandment itself appears. The later tradition’s instructions on how to become pluralistic are contained, in part, in the talmudic source quoted earlier describing the debates of Hillel and Shammai [J. Yevamot 1:6 (3b); B. Yevamot 14a-b. Compare also T. Yevamot 1:12]; One must, like Hillel, be affable and humble and teach opinions opposed to one's own, citing them first. (B. Eruvin 13b)