The schools of Shammai and Hillel for the very first time disagreed regarding a case of Jewish law. This occurred around the turn of the 1st century. In the ensuing generations, the schools argued regarding many different laws, until the law was established according to the teachings of the "House of Hillel" -- with the exception of a few instances. According to tradition, following the arrival of the Moshiach the law will follow the rulings of the House of Shammai.
All throughout, the members of the two schools maintained friendly relations with each other.
After a 12-day sea voyage, the previous Lubavitcher Rebbe, Rabbi Yosef Yitzchak Schneersohn (1880-1950), disembarked at the New York harbor on the 9th of Adar II of 1940, following his miraculous rescue from Nazi-occupied Warsaw.
Links:
Vintage film clip of the Rebbe's arrival in NY, March 19, 1940
More about Rabbi Yosef Yitzchak of Lubavitch
Any other time of the year, it’s just a cracker. Eat it on the night of Passover, and it nourishes your soul.
Because, in truth, all food feeds not only the body, but the soul as well.
That’s because, like everything else, food is a divine creation. It is sustained by a constant flow of energy from its Maker. When we consume food, we metabolize that divine energy and live from it.
The kind of food-energy we consume and the way we consume it has a lot to do with kind of person we become and the kind of life we end up living.
If we eat foods sustained by energy hopelessly distorted, corrupted, and disconnected from its origin, they pull us down with them and it becomes harder for us to keep in touch with our own soul. These are the foods that are not kosher.
But then, even the energy of kosher food needs to be reconnected to its origin. And we do that by investing whatever energy we’ve gained from this food into G‑dly deeds--a.k.a. mitzvahs.
Matzah on Passover is the exception. On the night of Passover, it’s not just a mitzvah to eat matzah; the matzah itself is a mitzvah. It’s already intimately connected with its source.
So that, rather than us having to reconnect this food, it reconnects us, nourishing both body and soul with divine light, carrying us to heights we could otherwise never achieve.
And so, writes Rabbi Shmuel of Lubavitch, matzah on Passover--especially on the first night--not only nourishes your divine soul, it softens up the animal instinct within you. Your inner beast becomes open to knowing something greater than itself.
At the very least, he writes, it allows your divine soul some respite.
As it turns out, matzah on Passover is not just food for the soul, it’s potent medicine for the human animal.