פירוש על עבודה זרה 38:1

When it comes to logic, it is better to learn from multiple teachers. This would seem to ensure that one’s logical deductions are correct. However, when it comes to memorizing oral traditions, learning from multiple teachers is problematic for different teachers phrase their teaching in different languages. This could create confusion.

A person should divide his days between the study of the different branches of Jewish learning, Scripture, Mishnah and Talmud. Interestingly, elsewhere in the Bavli they remark that in Babylonia, since their Talmud includes Scripture (which might include Midrash), Mishnah and Talmud, they fulfill this injunction by learning the Bavli alone. This was the path taken often throughout Jewish history—the Bavli has dominated the Yeshiva curriculum for a thousand years.