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Between the amateur and the professional . . . there is a difference not only in degree but in kind. The skillful man is, within the function of his skill, a different psychological organization. . . . A tennis player or a watchmaker or an airplane pilot is an automatism but he is also criticism and wisdom.

Between the amateur and the professional . . . there is a difference not only in degree but in kind. The skillful man is, within the function of his skill, a different psychological organization. . . . A tennis player