The festival of Sukkot, which follows Rosh Hashana and Yom Kippur, marks the beginning of the true days of rejoicing of the month of Tishrei, coming as it does after the solemnity of the High Holidays.
Although Sukkot has many similarities and characteristics in common with Rosh Hashana and Yom Kippur, it is actually the culmination and fulfillment of the first two holidays. The difference between the two lies in the fact that the holiness that was in a more concealed and hidden state on Rosh Hashana and Yom Kippur is revealed for all to see on "the day of our rejoicing (Sukkot)."
One of the fundamental themes of Rosh Hashana and Yom Kippur is that of the unity of the Jewish People. But it is on Sukkot that this motif finds its highest expression.
The Jew's worship on the High Holidays lies in his uncovering of the "pintele Yid" within him, that Jewish spark that can never be extinguished, that he shares in common with every other Jew. All of us stand as equals before G-d in prayer on Rosh Hashana, accepting His sovereignty and crowning Him King over us all; on Yom Kippur we are equally aroused to do teshuva (repent) and return to G-d. When a Jew does teshuva, he is merely uncovering and revealing his innate belief in G-d and love of Him.
The unity of the Jewish People during the High Holidays is a unity based on the common denominator inherent in every Jew. It does not take into consideration the many differences of temperament, intelligence, or any other marks which distinguish one person from another.
On Sukkot, however, we reach an even higher level of unity than before, developing the theme of Rosh Hashana and Yom Kippur further.
One of the most important mitzvot (commandments) of Sukkot is the taking of the Four Kinds. These four species symbolize the four different types of people which exist within the Jewish nation. The etrog (citron) symbolizes one who possesses Torah learning and also does good deeds; the lulav (palm) stands for one who possesses only Torah learning. The hadas (myrtle) symbolizes one who performs commandments and does good deeds, but does not have Torah learning, and the arava (willow) symbolizes the Jew who possesses neither Torah nor learning.
On Sukkot we take these four disparate species and bring them together to perform a mitzva. Our unity does not lie in our ignoring the external differences which divide us; rather, we go out of our way to include all types of Jews, even those in the category of arava, who would seem to have no positive contribution to make. Despite all our differences we are all bound together.
This is the highest degree of unity we can achieve. It is far easier to concentrate only on that which we have in common than to acknowledge that we differ as individuals and still remain together.
On Sukkot we verify and confirm the unity which was achieved during the High Holidays. This realization sustains us throughout the year and gives us the strength to live in harmony and solidarity with one another.