Idem and Ipse Identity

In Oneself as Another (1990), Ricoeur drew a distinction no previous philosopher had articulated with comparable precision: between idem-identity (Latin for 'sameness'—the stable traits, skills, and dispositions that make a person recognizable) and ipse-identity (Latin for 'self'—the capacity to keep promises and maintain commitments across change). Idem-identity is what personnel files track: competencies, character traits, professional expertise. Ipse-identity is what remains when every trait changes: the fidelity by which a person declares 'I will be this kind of person tomorrow' regardless of circumstantial shifts. AI disrupts idem-identity with devastating thoroughness—every skill that constituted professional character is being commoditized. But ipse-identity is untouched, because the machine cannot make or keep promises. The self constituted by commitment rather than traits survives the transition.