Before Yosef reveals himself to his brothers, as told in Parashat Vayigash, he weeps, as he had done several times earlier throughout this story. Here, he cries so loud "that the Egyptians could hear" (45:2). Perhaps it is the Torah's emphasis on the volume of this sob that led Chazal to afford it symbolic significance. The Midrash (Bereishit Rabba 93:13) comments, "Just as Yosef appeased his brothers only with weeping, so will the Almighty redeem Israel only with weeping, as it says, 'They shall come with weeping, and with compassion will I guide them' (Yirmiyahu 31:9)."
