According to Kuiper (1967, 1997: xxiv, quoted with approval by Witzel 1999a: 388), “between the arrival of the Aryans ( . . . ) and the formation of the oldest hymns of the RV a much longer period must have elapsed than normally thought.”

Kuiper as quoted in Elst, K: Linguistic Aspects of the Aryan Non-Invasion Theory, in Bryant, E. F. (2008). The Indo-Aryan controversy: Evidence and inference in Indian history. London: Routledge., also quoted in Witzel, Early Indian history: Linguistic and textual parametres.