 Foucault’s final engagement with traditional philosophy arises from the turn toward the ancient world he took in the last few years of his life. The History of Sexuality had been planned as a multi-volume work on various themes in a study of modern sexuality. The first volume, discussed above, was a general introduction. Foucault wrote a second volume (Les aveux de la chair) that dealt with the origins of the modern notion of the subject in the practices of Christian confession, but he never published it. (It was published posthumously in 2018.) His concern was that a proper understanding of the Christian development required a comparison with ancient conceptions of the ethical self, something he undertook in his last two books (1984) on Greek and Roman sexuality: The Use of Pleasure and The Care of the Self.