And who was it that said of the Torah, "What is hateful to you, do not do to your neighbor. This is the whole Torah; all the rest is commentary. Go and learn it."
Hillel, however, was talking about the
essential level of
ahavas Yisrael, where the Jew stands higher than Torah. On that level, the whole purpose of the Torah is as a means to reveal the essence of the Jew. Since a Jew’s essence is revealed by the
mitzvah of
ahavas Yisrael, it can therefore be said that it is the entire Torah and the rest is explanation; that is, that the rest of the Torah is the vehicle through which the essence of the Jew is revealed as exemplified in the
mitzvah of
ahavas Yisrael.
Chapter 7: Hillel and Rabbi Akiva - (Adapted from Likkutei Sichos, Vol. 17, pp. 215-224)