From Yancey’s Prayer, where he’s talking about God’s grace "… dropping as gentle rain from heaven":
"Grace allowed George Chen, arrested for his "barefoot evangelist" activities in China, to find a most unlikely prayer closet while serving an eighteen year sentence at hard labor. Guards forced him to work in the prison cesspool, where he spent his days knee-deep in human waste, turning it with a shovel to make compost. "They thought I’d be miserable, but actually I was happy." said Chen. "It smelled so bad that no one could come near me, so I could pray and sing aloud all day."