The Torah of Yisrael, characterized by the Rashbi, involves effortless and unimpeded Hamshachah from above to below, solely for the sake of the revelation of Divinity, without investiture in worldly dimensions. In contrast, the Torah of the other Tanaim invests itself in creation for the purpose of Birur, albeit from above to below. The former (Torah of Rashbi) is Pnimius Hatorah (the inner hidden level of Torah), whereas the latter is Chitzonius Hatorah (revealed aspects, Halacha).