They (= Games) are said to teach co-operation, but in fact they only teach it in its competitive form. This is the form required in war, not in industry or in the right kind of social relations. Science has made it technically possible to substitute co-operation for competition, both in economics and in international politics, at the same time it has made competition (in the form of war) much more dangerous than it used to be.
Source: On Education, especially in early childhood, 1926, Pt. 2： Education of character, chap. 5: Play and fancy
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