https://lutheranchinese.org/%e8%ad%89%e9%81%93%e9%a1%8c%e7%9b%ae%ef%bc%9a%e3%80%8c%e4%b8%bb%e7%9a%84%e5%a5%b4%e9%9a%b8%e3%80%8d/
證道題目:「主的奴隸」