If you return, etc.: From this, Rabbenu Tam said that Reish Lakish knew much at first, except that he removed the yoke of Torah [from himself], became an ignoramus and occupied himself with brigandry. Since he said, "If you return" - it implies, being like [you were] at first, and not to remove the yoke of Torah from upon you. And also [since] he said, "What benefit did you provide me, there they called me, Master" - meaning at first they also called me, Master, except I forgot [my learning]. And that which [Rashi] explained - "Master," is the master of the brigands - does not appear [correct]. Even though [it is true] that we find in Tractate Avodah Zarah (17b), "What is the reason they call you, Master? I am the master of weavers." And this is [also the explanation of] that which we say in the chapter [entitled] Kol Kitvei (Shabbat 119b), "Said Reish Lakish to Rabbi Yehudah Nesiah, 'So have I received it from my fathers' - and some say, from your fathers - 'any city that does not have children in a rabbi's school, etc.'" This implies that before Rabbi Yochanan taught him, he studied from others.

If you return: Later it is shown that he married [her]; as it says, "His sister came and she cried in front of him." And [Reish Lakish] was not concerned about, perhaps they will say that this one returned (repented) because of this, in the way that it was a concern later (Bava Metzia 85b).

The knife, the dagger [...], from when are they susceptible to impurity: Rabbenu Tam found it difficult - for we learn in Tractate Kelim, Chapter 14 (14:5), "A sword and a knife, from when does it become susceptible to impurity? The sword, from when it has been polished; and the knife, from when it has been sharpened." And that is not like Rabbi Yoachanan and not like Reish Lakish! But it appears that that mishnah is about when they got rusty and one comes to fix them. As it is learned in the Tosefta, "A sword and a knife that became rusty are pure. [If] one polishes them or sharpens them (they are susceptible to impurity). But at the beginning, their completion [which makes them susceptible to impurity], is as it is explained in our discussion (here in the Gemara). And it appears that, "polishes" refers to the sword; and "sharpens" refers to the knife, even though it is taught in the plural (them). So then the Tosefta is like the Mishnah.