Parshas VeZos HaBerachah is always read on Simchas Torah. The Talmud (Megillah 31a) tells us that the portions of the Torah that are read on the holidays were chosen by Moshe Rabbeinu. He picked each Torah reading because it is connected to that specific holiday. Our sages teach that one of the connections between VeZos HaBerachah and Simchas Torah is found in the passuk: 'Vayehi b'yeshurun melech...yachad shivtei Yisrael.' - "And there was a king in Yeshurun (Israel)... together, all the tribes of Israel."

Chassidus explains that Simchas Torah is the summing up of the avodah of Rosh HaShanah and the entire month of Tishrei. The beginning of this passuk - 'Vayehi b'yeshurun melech' - refers to the avodah of Rosh HaShanah when we proclaim HaShem as our King. The end of this passuk - 'yachad shivtei Yisrael' - speaks about achdus, uniting the Jewish people.

Both of these points are related to each other. In the avodah of proclaiming HaShem as our king, all Jews are equal. Why? The reason is that the way we do this is by having a strong feeling of bittul - total acceptance of HaShem.

Let us think about a king who rules over a country. When he is being crowned as the king, all his subjects - from the most important officer to the simplest worker - proclaim him as their ruler with the same level of acceptance. Later, as he goes about setting up his kingdom, there may be different rules and laws for the different ranks of people. When he first ascends the throne, however, everyone accepts him equally. In the same way, on Rosh HaShanah when we proclaim HaShem as our king, all the Jews are equal.

Now let us try to find the connection between this message - our achdus on Rosh HaShanah - and Simchas Torah. The main activity on Simchas Torah is simchah. We mentioned that Simchas Torah sums up the entire month of Tishrei. So how does the holiday of Sukkos fit into the picture? It seems easy connect Sukkos - z'man simchoseinu - to Simchas Torah, but let us take a closer look.

The simchah is brought out through the mitzvos of sitting in the sukkah and making the berachah on the four minim. Still, there are four different minim - lulav, esrog, haddasim and arovos - and the obligation to perform this mitzvah does not apply in the same way to everyone. Even at the highlight of the Sukkos celebration in the Beis HaMikdash, at Simchas Beis HaShoeivah, the Talmud tells us that only certain people performed the mitzvah of pouring the water on the mizbeach, some danced, and the rest came to watch and listen.

We see from this that the simchah of Sukkos is limited to the mitzvos of the holiday, and not everyone is equal in their performance. But the simchah on Simchas Torah is not connected to a specific theme or mitzvah. This simchah is only for the sake of being joyous and expressing happiness. In simchah, everyone is the same, and the achdus which has been brought out on Rosh HaShanah is stressed and celebrated on Simchas Torah.

(Adapted from Likkutei Sichos Vol. XIV p. 164)