  In terms of the historical contest, Empiricism emerged triumphant, and as inevitably happens in such victories, anti-Nativism triumphed over Nativism. The doctrine of innate ideas came to be seen as backward and unscientific, as inextricably tied to discredited metaphysical and theological doctrines, and as therefore incompatible with a naturalistic approach to human nature. Empiricism developed very much along Humean lines (and with Anaxagoras’ anti-speculative hard-headedness). The 20th century Logical Positivists and Logical Empiricists agreed with Hume that we have no a priori knowledge about the intelligible structure of the  world.[15] A priori knowledge is only possible in the formal sciences, and this is so only because such knowledge is ultimately about the structure of our concepts and/or our language. Others, following Quine, have gone a step further and followed John Stuart Mill’s lead in rejecting all claims to knowledge of apriori necessary truths. For Quine, only our sensory evidence ultimately warrants the claim that  2+2=4.[16] On both views, once we get straight about the true nature and extent of our knowledge, Nativism turns out to be an unnecessary extravagance.