Q: What is the meaning of the 70 bulls that were sacrificed in the Temple on Sukkot?
A: 70 bulls were sacrificed in the Temple on Sukkot. On the first day 13, on the second day 12, etc. These 70 bulls represent the spiritual abundance upon which the 70 nations of the world exist. The sacrifices bring this abundance down to earth. Each day one less bull is sacrificed to signify that the individual, separate and egocentric consciousness of the nations lessens as they recognize that the source of their spirituality comes from the nation of Israel, the source of holiness.
These 70 bulls were offered as a sacrifice over the 7 days of Sukkot. Once this was complete, on the eighth day called Shemini Atzeret, one single bull was sacrificed, representing Israel alone.
The Torah has 70 faces, or different explanations. A deeper explanation for the 70 sacrifices is that they represent the 70 sages of the Sanhedrin (the Torah High Court), each corresponding to one of the Faces of the Torah. The one bull represents the "Moshe Rabbeinu of the generation," the individual who is known as the "Wondrous one of the generation," corresponding to the inner essence of the Torah, of which it is said, "The Torah and G-d are one."