In Mind and World, John McDowell concludes that human beings and, principally by their initiation into language. Such of human development typically represent first-language learning as a movement from a non-rationally secured conformity with correct practice, through increasing understanding, to a state of rational mastery of correct practice. Accordingly, they tend to invoke something like Wittgenstein's concept of training to explain the first stage of this process. This essay considers the cogency of this view of learning and development. I agree (...) with Sebastian Rdl believes. I conclude by considering the relevance of McDowell's view of second nature to two striking ideas: Ian Hacking's suggestion that the development of autistic children is and Derek Parfit's claim that persons are not human beings. (shrink)