Johann Arndt (1555–1621) was a German Lutheran pastor and theologian. Serving parishes through plague and controversy, he wrote to revive inward, heartfelt faith within the orthodox Lutheran church. His True Christianity (1605–1610), in our library, joined doctrine with repentance, prayer, and new life, and became one of the most translated devotional books in Protestant history; he is regarded as a forerunner of Pietism.
Free: get it — here or in the Christian Classics app — and it's yours to read and listen to on every device you sign in to. About a tenth of it can be read here first, free.
Johann Arndt's True Christianity, first published in 1610, is a landmark of Lutheran devotional writing and a fountainhead of later Pietism. Arndt protests against a merely nominal faith, calling readers to repentance, living union with Christ, and a holy life that proves doctrine true. Its earnest, searching piety influenced generations of readers far beyond Arndt's own church.