Kant's warning about self-observation in Anthropology from a Pragmatic Point of View

In a short section near the beginning of Anthropology from a Pragmatic Point of View, Immanuel Kant warns that "observing oneself" can easily lead to "enthusiasm and madness." The transcripts of his lectures from the 1780s show that Kant did not always regard self-observation so negatively. However, by the time he published the Anthropology in 1798, Kant was convinced that diaries of self-observation contained false accounts of self-observers' inner states. He also believed that self-observers often mistake imaginary self-images for a self they have passively observed. Kant thought these falsehoods and fictions posed a danger to the mental health of those who practice self-observation. He included a warning about this danger in his Anthropology because of his "pragmatic" approach, which treats anthropology as a kind of medicina mentis.