The church was badly in need of a coat of paint...
So the pastor decided he'd do the job himself. But all he had was one bucket of paint. So he got a bunch of buckets and some water, and he thinned the paint enough to cover the entire church. Then he spent all day painting. That night it rained—very hard—and washed all the paint off.
The pastor was quite discouraged and asked God, 'Why...why God, did you let it rain and wash off all my hard work?'
To which God thundered his reply, 'Repaint! Repaint! And thin no more!