Am odd thing to say after proclaiming how the creation of the doctrine is clearly the result of Beahmanic focus on sacrifice as the heart of their religion. In fact, this entire preceding section, while certainly plausible, is entirely un-cited. I have no way to know if Eliade thought of a plausible reason to move from the ritualistic focus of the Rig Veda to the more spiritual focus of the Upanishads and then just proclaimed his plausible explanation to be fact.

