"To furnish the means of acquiring knowledge is the greatest benefit that can be conferred upon mankind. It prolongs life itself, and enlarges the sphere of existence."

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We do not for example say that the person has a perfect knowledge of some language L similar to English but still different from it. What we say is that the child or foreigner has a 'partial knowledge of English' or is 'on his or her way' towards acquiring knowledge of English, and if they reach this goal, they will then know English.

— Noam Chomsky