Why did Leo Tolstoy begin keeping a diary in 1847?

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Leo Tolstoy began keeping a diary in 1847, the same year he left the university without a degree and returned to his family estate, Yasnaya Polyana.

This diary served as a laboratory for his experiments in self-analysis and, eventually, for his fiction. The early entries reflect the lifestyle he was leading at the time, beginning with a candid admission that he may have contracted a venereal disease. Furthermore, the diaries document his intense fascination with rule-making; he frequently composed rules for his social and moral behavior, only to record his repeated failures to follow them, leading to cycles of self-castigation and attempts to formulate new regulations for self-control.1