Eclipse of Reason

Eclipse of reason, Horkheimer's 1947 diagnosis, traces the transformation by which reason lost the capacity to evaluate goals and retained only the capacity to optimize their achievement. Substantive reason asks what ends are worth pursuing—it evaluates the good, the just, the meaningful. Instrumental reason takes ends as given and asks only how to achieve them efficiently. The eclipse is the progressive displacement of the first by the second, until a culture organized around instrumental efficiency loses the institutional and cognitive apparatus for asking substantive questions with the seriousness instrumental questions automatically command. The transformation is not experienced as loss because instrumental reason delivers measurable results: greater productivity, faster execution, more output per input. What cannot be measured—meaning, beauty, moral weight, the quality of human experience—has no metric and therefore no validity in a culture that has made measurement the standard of truth.