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In L’ordre du discours, Foucault distinguishes three types of internal “limitations” in discourse: the technique of commentary, reliance on authors, and, opposed to the previous two, the training of teachers of the subjects. However, this opposition also sheds new light on the history of school culture, which for two or three centuries, and not before, has been structured as a set of subjects that themselves incorporate the standards of legitimacy of the objects of knowledge (standards of experience) and the standards of truth of scientific statements (standards of proof).