None of the abstract concepts comes closer to fulfilled utopia than that of eternal peace.

In Adorno’s idiom, “fulfilled utopia” names not a blueprint for a perfect society but the thought of reconciliation: a condition in which domination, coercion, and the compulsion to instrumentalize people and nature have ceased. By calling “eternal peace” the abstract concept that comes closest to such fulfillment, the line elevates peace beyond a merely political program (treaties, balances of power) into a regulative image of a world no longer organized by violence. The phrasing also hints at Adorno’s suspicion of positive utopian pictures: only in the negative—imagining the end of war and fear—can thought approach utopia without turning it into ideology.