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Criticism may be said to continue the work of natural selection on a nongenetic (exosomatic) level: it presupposes the existence of objective knowledge, in the form of formulated theories. Thus it is only through language that conscious criticism becomes possible. This, I conjecture, is the main reason for the importance of language; and I conjecture that it is human language which is responsible for the peculiarities of man (including even his achievements in the nonlinguistic arts such as music).
Karl Popper, Unended Quest
