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Learning many languages. To learn many languages fills the memory with words instead of with facts and ideas, even though in every man, memory is a vessel that can take in only a certain limited amount of content. Also, learning many languages is harmful in that it makes a man believe he is accomplished, and actually does lend a certain seductive prestige in social intercourse; it also does harm indirectly by undermining his acquisition of well-founded knowledge and his intention to earn men's respect in an honest way. Finally, it is the axe laid to the root of any finer feeling for language within the native tongue; that is irreparably damaged and destroyed. The two peoples who produced the greatest stylists, the Greeks and the French, did not learn any foreign languages.
But because the commerce of men must become increasingly cosmopolitan and, for example, a proper merchant in London must be able to make himself a necessary evil. When it finally reaches an extreme, it will force mankind to find a remedy for it, and in some far-off future time everyone will know a new language, a language of commerce at first, then a language of intellectual intercourse generally, and this as surely as there will one day be aerial navigation. Why else would the science of linguistics have studied the laws of language for a century and assessed what is necessary, valuable, and successful about each separate language!