Corrie ten Boom, whose book, The Hiding Place, was made into a successful movie, was incarcerated with her sister Betsie in the Ravensbruck concentration camp. Amongst the many torments they suffered was the fact that their hut was infested with fleas. However, Betsie, a woman of deep faith, insisted that instead of complaining about the fleas, they should practice the discipline of thanksgiving, quoting that verse from the Bible that says: ‘In everything give thanks: for this is the will of God in Christ Jesus concerning you.’ Meanwhile, they’d secretly began to conduct nightly Bible studies with other prisoners. But despite living in fear of being discovered, the sadistic guards never entered their hut. It was only later they learned it was because of the fleas that the guards stayed away.