I got this off the wikipedia article for Jerome. I think this is a really great quote – similar to the “lazy hands are the devils workshop” proverb.
“Be ever engaged, so that whenever the devil calls he may find you occupied.”
Jerome was a Christian in the 4th Century and was responsible for translating the Original Languages (Hebrew and Greek) into Latin, called the Vulgate. This translation of the Bible was the only authorized translation of the church (Roman Catholicism) until the Protestant Reformation.