A rabbi's authority rests fundamentally on learning rather than on a sacramental ordination conferring a distinct spiritual status: semicha, rabbinic ordination, certifies that its holder has mastered a defined body of Jewish legal and textual sources sufficient to render authoritative rulings on Jewish law, halakha, and to teach, rather than conferring any change in the rabbi's own spiritual standing as a Jew, since Judaism does not hold that ordination changes a person's relationship to God the way sacramental ordination is understood to in Catholic or Orthodox Christian theology. A rabbi's typical responsibilities, teaching, answering questions of Jewish law and practice, officiating at life-cycle events including weddings, funerals and conversions, and, in a congregational setting, delivering sermons and leading or overseeing worship, combine legal, educational and pastoral functions considerably more integrated than the separation between preaching and law commonly found in many Christian clerical roles.
Because rabbinic authority derives from demonstrated mastery of texts rather than from an unbroken sacramental succession, a rabbi's rulings carry weight in proportion to his or her recognized scholarship and standing among peers rather than through appeal to an official hierarchical rank alone, a structure that has historically allowed considerable diversity of legal opinion to coexist within Judaism without a single central authority empowered to resolve every dispute definitively.