Tinyana 30 · תנינא ל׳

When a new book comes into the world—and it is explained in our teachings that there are original insights which are produced through tears (as is brought in Likutey Moharan I, 262)—then the tears of the original insights which form this new work counter the evil decrees of the nations and eliminate them.

This matter is clear, because all their strength derives from the tears of Esav. Therefore, where there are these aforementioned tears, they counter them and cancel them out.

This is alluded to in the letters that spell B’ KhiYaH (crying), which are the first letters of “B’nei Yisrael K’chol Hayam.” Just as the sand protects against the waves and prevents them from flooding the world, crying and tears protect Israel from the evil decrees of the nations.

This is “The mispar (number) of the people of Israel will be like the sand of the sea.” MiSPaR alludes to MiSePheR (from the book), which was mentioned previously. Because of it—i.e., the crying and tears of the original insights in the book, which protect them—“the people of Israel will be like the sand of the sea.”