The Alchemist by Paulo Coelho

"Dusk was falling as the boy arrived with his herd at an abandoned church. The roof had fallen in long ago, and an enormous sycamore had grown on the spot where the sacristy had once stood.

He decided to spend the night there. He saw to it that all the sheep entered through the ruined gate, and then laid some planks across it to prevent the flock from wandering away during the night. There were no wolves in the region, but once an animal strayed during the night, and the boy had to spend the entire next day searching for it. He swept the floor with his jacket and lay down, using the book he had just finished as a pillow."