The gemara has 2 long discussions to prove that Rabbi Yehuda holds L'chatchila one should say shema so that he can hear the words. Bede-eved if he does not hear them he is Yotzeih.
At the end, Rav Chisda brings 2 memras that 1) the halacha is like Rav Yehuda in our Mishna and 2) in the beraiso of Rabbi Elazar ben Azaria. The gemara says we need both halachos so that (basically) I know that Rav Yehuda holds L'chatchila one should say shema so that he can hear the words. Bede-eved if he dows not he is Yotzeih.
Isn't this exactly what the previous daf and half was about? Do I really need to have both memros about the halacha? Wouldn't I know it from the previous discussion?
martin fogel, carlsbad, USA
The Gemara previously concluded that there are two possible ways one could understand the position of Rebbi Yehudah. Either he argues on his Rebbi, and holds that one can l'Chatchilah say Shema even if he does not hear himself reciting the words, or he agrees with his Rebbi that this is only b'Di'eved. Even though the Gemara is favorably disposed towards the second approach, so as not to make an argument between Rebbi Yehudah and his Rebbi, both are possible. It was therefore appropriate for Rav Chisda to clarify the stance of Rebbi Yehudah by saying that the Halachah is like both Rebbi Yehuda and his Rebbi, showing that this is not only the preferable approach, but also the Halachic approach.
All the best,