About Paul Gerhardt
Paulus or Paul Gerhardt was a German theologian, Lutheran pastor and hymnodist, considered Germany's greatest hymn writer. His songs and hymns were published in contemporary hymnals such as Praxis pietatis melica, and are still part of modern hymnals. Hymn stanzas by him feature prominently in Bach's Passions and the Christmas Oratorio.
Biography source:
Wikipedia
