Rabbi Oshaia asked what the prophet meant when he wrote, "I took unto me two staves; the one I called Amiable and the other Destroyer" (Zechariah 11:7). The answer the sages offered is a portrait of two houses of study.
The staff called Amiable, they taught, represents the disciples of the wise in the Land of Israel, who argued fiercely over Torah yet remained gentle with one another across the table. The staff called Destroyer represents the disciples of Babylon, whose debates were so hot-tempered that the argument itself began to wound.
What then is the meaning of the name Babel, Babylon? Rabbi Yochanan played on the Hebrew root and said it means bilbul, confusion — confused in Scripture, confused in the Mishnah, confused in the Talmud. Lamentations had already warned: "He has set me in dark places, as they that be dead of old" (Lamentations 3:6).
The sages are not shaming Babylon; they are diagnosing it. A tradition can be learned and still not be loved. The work of study is to hold both staves, the sharp and the kind, so neither breaks.
(From the 1901 Hebraic Literature anthology, citing Sanhedrin 24a.)