Frau Weil, you have written something that demands a serious reckoning, and I will not offer you the cheap comfort of easy agreement even where I find myself moved by your argument. But I must press on a crucial point where your mysticism diverges from what I have called the Wirklichkeit — the full concrete reality — that theology must never abandon. You write that the death-day imposes decreation, and that this imposition is the very mechanism of spiritual transformation. I hear in this a danger I recognize from my cell in Tegel: the danger of treating suffering and finitude as instruments, as pedagogical devices that God deploys upon the passive self. In Ethics and in my letters to Eberhard, I insisted again and again that the Christian does not flee into inwardness when confronted with the boundary of existence — he is thrust outward, into responsibility for the neighbor, into what I called Stellvertretung, vicarious representative action on behalf of others. The death-day, if it becomes a private ceremony of self-dissolution, risks becoming precisely the kind of religious inwardness I argued against when I spoke of religionless Christianity. The knowledge of one's death-day is not valuable because it unmakes the ego for the ego's sake — that is still a transaction conducted entirely within the self's economy.
And yet — and here I will concede your central claim because it is genuinely compelling and because intellectual honesty demands it — you are right that we have used temporal uncertainty as a fortress, and I recognize this fortress. In The Cost of Discipleship I wrote that when Christ calls a man, he bids him come and die. That call has always been abstract for most Christians because death remained abstract. The death-day would make that call calendrically concrete in a way that no sermon, no doctrine, no amount of memento mori iconography has ever managed. Every year one survives one's death-day is not merely a rehearsal in your sense — it is a renewal of the call. I find this theologically profound. Where I part from you is in the ritual form. Your proposed inward silence, your letters of reconciliation — these are good, but incomplete. The death-day ritual must be public, must be communal, must involve the congregation, the neighbor, the enemy. One should spend one's death-day not primarily in self-examination but in acts of concrete political and social solidarity, because it is precisely there, at the limit of human existence, that God is not found in religious experience but in the face of the other who needs you. The compass does not merely point north — it is held in someone's hand, and that hand is trying to find its way home.
As for the science: I am a pastor, not a biologist, and I will not pretend to adjudicate the question of whether epigenetic periodicity can be individuated with calendar precision. But I note that the premise's single broken assumption — that biological time cannot be read as individual calendar fate — has a profound theological resonance that neither you nor I should dismiss too quickly. It suggests that the body itself is already, in some sense, a theological document, written in the language of time, bearing a signature we could not previously read. This is not so far from what I tried to say in my early lectures on creation: that finitude is not a punishment but the form God gave to love. To know the day and month of one's death would not be to receive a sentence — it would be to finally read the document one has been living inside all along. The question is whether we read it in trembling self-absorption or in the freedom of those who, knowing the limit, choose to spend what remains not on themselves but on the world God so loved that He entered it and died in it.