This is the first major dualism to emerge in the nature of everything in the Universe.[20][2]: 1–2 Hale (1999), in his review,[2] states that Kuiper theory on Asura is plausible but weak because the Vedas never call Vrtra (the central character) an Asura as the texts describe many other powerful beings.[2]: 3 Secondly, Rig Veda never classifies Asura as "group of gods" states Hale, and this is a presumption of Kuiper.[2]: 3