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 Rebbi: A bracha is recited each time one dons tefillin. 

 Chachomim: One only recites the bracha in the morning. 

 Summary 

 Abayye: The halacha follows Rebbi.

 Rava: The halacha follows the Chachomim.

 Rav Mari brei d’bas Shmuel: I saw that Rava didn’t follow the Chachomim in practice; when he left the bathroom he made a new bracha on his tefillin. 

We also follow Rebbi and recite the bracha all seven days.

 Mar Zutra: Whenever Rav Papi would put on tefillin, he would make a bracha. The Rabbanan d’bei Rav Ashi would make a new bracha every time they would touch their tefillin*.

 Rav Yehuda quoting Shmuel: The mitzvah of lulav [d’orayso] is all seven days.

 Rabbi Yehoshua ben Levi: The mitzvah of lulav [d’orayso] is only the first day, all other days is a d’rabbanan.

 Rabbi Yitzchok: Every day is a d’rabbanan. 

 Challenge: But we know that the first day is a d’orayso? 

 Resolution: It means “all days except for the first.”

 Challenge: But then Rabbi Yitzchok would be repeating the opinion of Rabbi Yehoshua ben Levi?

 Resolution: It should read “And thus said Rabbi Yitzchok as well”.

According to Rav too, the mitzvah is all seven days and one makes a bracha [as we see with regard to Chanuka which is certainly d’rabbanan and a bracha is recited].

 Rabbi bar Ashi quoting Rav: One who lights candles on Chanuka recites a bracha. 

 Rabbi Yirmiyah: One who sees** candles on Chanuka recites a bracha. 

 Rav Yehuda: On the first day, one who lights recites three brachos and one who sees recites two. On subsequent days, one who lights recites two brachos and one who sees recites only one.

The bracha is “Who has sanctified us with his mitzvos and has commanded us to light the Chanuka candles”.

 Challenge: Where has He commanded us? It’s a d’rabbanan! 

 Resolution: “Do not turn aside from all that they command you”.

 Rav Nachman bar Yitzchok: “Your zekeinim will tell you”.

 Rav Nachman bar Yitzchok taught this explicitly [that Rav’s opinion was not inferred from Chanuka but that he taught it with regard to Sukkos]: Rav: The mitzvah of lulav is all seven days.

 Click here to listen to the shiur with Tosfos https://drive.google.com/file/d/1mxZfVnfxjPjcnuV9KO260gRX-Zk0YkIn/view?usp=sharing

* Tosfos: The bracha was probably lishmor chukov (we have a zecher to this bracha nowadays at the end of Uva letzion). 

* *Tosfos: A bracha is not recited for seeing other mitzvos because of how beloved the mitzvah is. Others say that this bracha is because not everyone has a house, but this is difficult because there is no bracha on seeing the mezuzah.