Ethics cannot be based on any pre-given account of the subject, because the subject is not something that one is, but is rather something that one becomes. One can only speak of the subject in Badiou as a subject-in-becoming insofar as it shapes itself in relation to the demand apprehended in a situation.

Simon Critchley, Infinitely Demanding; Ethics of Commitment, Politics of Resistance (Verso, 2007) p. 44