The difference between a Jewish and a non-Jewish person stems from the common expression: ‘Let us differentiate.’ Thus, we do not have a case of profound change in which a person is merely on a superior level. Rather, we have a case of ‘let us differentiate’ between totally different species.
This is what needs to be said about the body: the body of a Jewish person is of a totally different quality from the body of all nations of the world. The entire creation exists only for the sake of the Jews.
Rabbi Menachem Schneerson