We now find ourselves in possession of two entirely different items, both of which we call Proto-Indo-European: one, a set of reconstructed formulae not representative of any reality; the other, an undiscovered (possibly undiscoverable) language of whose reality we may be certain.
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Pulgram, E. 1959. "Proto-Indo-European Reality and Reconstruction." Language 35:421-426. quoted in Bryant, E. F. (2001). The Quest for the Origins of Vedic Culture : the Indo-Aryan migration debate. Oxford University Press. ch 4