This paper formulates the categories of "ethics," "self," and "subject" for an analysis of classical rabbinic ethics centered on the text, The Fathers According to Rabbi Nathan. Early rabbis were concerned with the realms of life that today's scholars describe as ethics and self-cultivation, yet they had no overarching concepts for either the self/person or for ethics. This analysis, then, cannot rely only upon native rabbinic terminology, but also requires a careful use of contemporary categories. This paper first sets out basic features of Rabbi Nathan and presents appropriate formulations of the relevant scholarly terms. The latter sections address possibilities for employing and revising these categories in descriptive and comparative studies more broadly, first surveying relevant scholarship on Christian, Muslim, and Manichaean sources, and then turning to ancient East Asian sources with a particular focus upon passages in the Zhuangzi.EARLY RABBIS HAD A LARGE VOCABULARY through which they set out norms for action and character: ideals that the sages prescribed for students, the ways that the tradition (torah) interacted with basic impulses (yetzer, lev), and the motivations and emotions that a person was to maintain in relation to God, particularly love ('ahavah) and fear or reverence (yir'ah). Through such categories, and others, they discussed the nature of human emotions and desires, ideal states, and ways to transform oneself to attain such ideals. That is, they were concerned with ethics and self-cultivation, yet they had no overarching concepts either for the self/person or for ethics. A study of rabbinic ethics, then, cannot rely only upon native rabbinic terminology, but also requires a careful use of contemporary categories. In this paper, I first set out basic features of rabbinic ethics in the sources I examine, and then I present accounts of "ethics," the "self," and the "subject" that I argue are appropriate for expositing this particular case. My theoretical work aims not only to open up an account of this cultural group, but also to contribute to descriptive, JRE 33.2:255-291. C 2005 Journal of Religious Ethics, Inc.