The objection that knowledge of one's death-day produces only paralysis rests, I think, on a hidden assumption worth excavating: that awareness of constraint is itself a form of imprisonment. But consider how we speak of the artist who works under commission, the revolutionary who knows the regime is closing in, the mother who has been told her child has months to live. Do they dissolve into morbidity? More often, they concentrate. The knowledge does not colonize — it clarifies the field. What was previously a vast, undifferentiated space of possibility, which is to say a space so large as to permit the indefinite deferral of all genuine choice, becomes a bounded terrain in which each step carries weight.
What troubles me about the colonization argument is that it implicitly romanticizes vagueness. It treats the blurred horizon of ordinary mortality as though ambiguity were itself freedom. But this is precisely the confusion I tried to address in The Ethics of Ambiguity — the confusion between freedom and the avoidance of freedom's demands. The person who drifts through decades telling herself she has not yet decided who to be is not exercising her freedom; she is fleeing from it. She is, in Sartre's phrase, in bad faith, but in a particularly comfortable variety — the bad faith underwritten by an open-ended future. The known death-day forecloses that comfort. And discomfort, here, is not pathology. It is the very texture of authentic engagement with one's situation.