Torah is extremely diverse. Within every facet of Torah, there are four general ways to explain the concepts at hand: “P’shat,” “remez,” “drush,” and “sod”. We are also told that there are“shivim panim laTorah,” seventy angles of how to understand each concept in Torah.
The Rebbe explains that the reason Torah is essentially one, even though it seems so diverse and multi-faceted, is because the Torah comes from Hashem—who is the ultimate “One".