中學時期讀歐洲歷史的時候，通常講到宗教改革，老師大概都會提到馬丁路德的95條和加爾文的預定論（predestination）；至於其他的人物，學識比較淵博的老師可能會稍微補充，但是也會馬上以台式教育的邏輯告訴你「這個不會考」，慈運理就是一個這樣的人物——他算是加爾文的前輩、馬丁路德的「同梯」，但無論是在歷史課本上或是在教會歷史上都往往被遺忘；唯獨到了蘇黎世，會發現他是這裡最重要的歷史人物，即使是短短幾個小時的停留也很難忽略他的存在。

In addition to a church leader and a theologian, Martin Luther was also a hymn writer. He composed both lyrics and tunes for his congregation. His famous piece “A Mighty Fortress Is Our God” has been sung by Protestant churches till now. But this was all I knew about his music. As a church musician, more questions came to my mind: how did he write hymns? How did his life experiences shape his music? How did people worship with his music?