For our inheritance has come to us on the east bank of the Jordan. Certainly, the source of Eretz Yisrael's holiness lies on the west bank of the Jordan River. However, once Bnei Yisrael had defeated the attacks of Sichon and Og and captured their lands, the holiness of Eretz Yisrael crossed to the east bank of the Jordan to meet Bnei Yisrael. Both the Haggadah and the verse in Yirmiyah are teaching us a fundamental lesson about education. Perhaps the kohanim did lecture to the Jewish people about Hashem, but lecturing is insufficient.
Questions cause people to think, and the answer which follows stays with the listener longer.
It is precisely because Pesach, matzah and maror are so crucial to the Seder's message that they must be presented as questions and answers. Similarly, the kohanim are blamed for not being effective teachers because they did not use a question and answer format. Among these was our subject, best known as the author of Merkevet Hamishnah, a work which is considered by many to be among the most important commentaries on Rambam's Mishneh Torah. R' Shlomo was born in Zamosc to a wealthy family which continued to support him throughout his rabbinical career. His father, R' Moshe, was a Torah scholar as well.