Philipp Jakob Spener

Spener stands at the head of the Pietist current Weber treats as a decisive tributary of ascetic Protestantism, insisting that true faith be proven in the conduct of daily life rather than in doctrinal orthodoxy. That inward demand creates the tension Weber keeps probing: a piety that turns away from the world may, paradoxically, intensify a believer's methodical engagement with it. For the early-middle arc of the argument, Spener matters because he marks the moment when religious seriousness becomes a portable ethic, capable of shaping work, thrift, and self-surveillance long after its theological fire cools.