Charles Yang

“So is language change progress or degeneration? It is neither, of course. To assert that language change is for the better or worse requires some measure of what "good" or "bad" language is, and the issue of language change needn't come into question here. But no coherent criterion has ever been given: upon examination, the pronouncements of the self-appointed pundits are always a mix of cultural biases, half-understandings of languages, and an obvious compulsion for telling people what to do.”
― Charles Yang, The Infinite Gift: How Children Learn and Unlearn the Languages of the World

“Learning grammar can be viewed as a game that a little boy plays with his father. Daddy talks, the boy listens — perhaps disobeys — and Daddy talks some more. All the while the boy is trying to figure out the grammar that can generate the sentences in Daddy's speech. The boy might occasionally talk back, but there is no guarantee that Daddy will pay any attention. Not that he is a bad father: recall from Chapter 5 that in some cultures, adults do not interact with children until they are socially and linguistically adept. To fully understand the game of language learning, then, Daddy can be assumed only as a rather passive participant. The goal of the game is to learn Daddy's grammar within some finite amount of time: nobody learns forever.”
― Charles Yang