 A canonical objection to the attempt to ground morality on rationality alone is that it fails to account for the special bonds and ties we have with our loved ones and thus fails to capture the nature of integrity and morality (Williams 1981: chapters 1–2). To address these worries, Korsgaard introduces the notion of “practical identities”, which specify roles as sources of special obligations (Korsgaard 1996a: 101, §3.3.1; Korsgaard 2009: 20). For instance, Guy values himself and finds his life worth living and his actions worth undertaking under the description of being a teacher of music, an American citizen, and Robert’s best friend. These practical identities govern Guy’s choices, sustain his integrity, and are sources of specific obligations to his pupils, fellows, and friends. However, we do not have obligations just because we occupy certain roles as teachers, citizens, or friends. Rather, such roles become practical identities, and sources of reasons, insofar as we reflectively endorse them (Korsgaard 1996a: §3.3.1; Korsgaard 2009: 22). Reflective endorsement, in turn, requires that we test our loyalties and allegiances according to the principle of universality, which commits us to morality. In order to value ourselves under these specific descriptions, we must value humanity in ourselves and in others (Korsgaard 2008: Lecture 6, 25–26).