Image of the first complete Mishnah. Photo: The British Library.

On May 13, at a national conference in Jerusalem dedicated to repairing Israeli society and building a shared civic future, Israel’s President, Isaac Herzog, warned that division had become the country’s most urgent internal threat.

I was surprised to learn recently that Jewish unity was elusive even in the dire circumstances of the 1943 Warsaw Ghetto Uprising, the largest Jewish revolt against Nazi Germany during World War II — when a few hundred poorly armed Jewish fighters held off a much larger and far better equipped German army for almost a month. (The uprising ended 83 years ago, on May 19.)

During the uprising, there were two Jewish rebel forces: the ZOB (members of left wing groups, such as HaShomer HaTzair and the Bund), and a parallel organization, the ZZW (made up of youth from the political right — Betar and the Revisionists). While the two organizations cooperated to some extent and fought the Germans in parallel, they were never a unified force. Of course, it didn’t really matter. The German army was far too powerful for a few hundred inadequately armed insurgents.

Obviously the current day State of Israel — and its 78 year history — proves that Jewish cooperation does happen. Another example that comes to my mind is the Jewish experience nearly 2,000 years ago at Yavne, a town on the coastal plain of the Holy Land. That was when Rabbi Yohanan ben Zakai ensured Jewish continuity after the destruction of Jerusalem and the Second Temple in 70 CE, by establishing a Jewish academy at Yavne and reconstituting the Sanhedrin.

Jewish society during the lead up to the First Roman-Jewish war was a sectarian society dominated by two groups — the Pharisees, the group responsible for the establishment of the synagogue as a focus of Jewish life outside the Temple, and the Sadducees, the priestly caste that administered the Temple.

Both groups shared the same written scriptures and many traditions. But they differed in that the Pharisees believed in resurrection after death and in the authority of the Oral Law, as well as the Torah. The Sadducees did not.

One American scholar, Shaye J. D. Cohen, describes how the rabbis who gathered in Yavne ended Jewish sectarianism and created a society that tolerated and even encouraged vigorous debate. The result was the abandonment of sectarian labels such as Pharisees and Sadducees, and the writing of the Mishnah.

In all likelihood, most of the rabbis at Yavne were Pharisees, and the centerpiece of Sadducee life, the Second Temple, was gone. However, there is no indication that the rabbis of Yavne were motivated by Pharisaic triumphalism. The goal was not exclusivity, but rather elasticity. Cohen notes that the Mishnah is the “first work of Jewish antiquity which ascribes conflicting legal opinions to named individuals who, in spite of their disagreements, belong to the same fraternity. This mutual tolerance is the enduring legacy of Yavneh.”

A year before he passed away, the late Rabbi Jonathan Sacks published what he titled Seven Principles for Maintaining Jewish Peoplehood. The list includes points such as the need to keep talking, to listen to one another, and to respect one another. But most important of all, never seek victory. I think this is what the rabbis at Yavne understood very well. Rabbi Sacks’ message to the diverse factions that make up Israel’s political and social fabric would be, “Do not think in terms of victory or defeat. Think in terms of the good of the Jewish people.”

Jacob Sivak, a Fellow of the Royal Society of Canada, is a retired professor, University of Waterloo.