.ט”ו Reverse Logic

תנן התם חרש המדבר ואינו שומע לא יתרום ואם תרם תרומתו תרומה מאן תנא חרש המדבר ואינו שומע דיעבד אין לכתחלה לא אמר רב חסדא ר' יוסי היא

It is intriguing to me that the logic employed throughout this דף seems to be directly contrary to that which used at the beginning of the פרק. When רבי declares that שמע must be read as it is written, in לשון הקודש, based on the word והיו, (and the רבנן hold to the contrary based on the word שמע) the assumption made by the גמרא is that if this is רבי’s opinion here because of the specific wording of the פסוק, that must mean that he holds exactly the opposite in all other instances.

In our גמרא we also find that ר’ יוסי bases his opinion on the word שמע which would seem to imply that it is exclusive to the realm of קריאת שמע. Nevertheless, the גמרא then proceeds to assume this opinion, that one requires to hear what they are saying is common to ר’ יוסי in all other realms. This seems to be the exact opposite logical flow is that on דף י”ג.

(תוספות ask a number of similar questions on the flow of the גמרא but I don’t think they are formulated in quite the same manner.)