Ravensbruck was known as one of the worst German concentration camps during World War II. When Corrie ten Boom and her sister Betsie found themselves imprisoned there, they were disgusted to discover that their barracks were infested with fleas.
When Corrie began to complain, Betsie insisted that they instead give thanks, quoting 1 Thessalonians 5:18, “In every thing give thanks: for this is the will of God in Christ Jesus concerning you.” With some persuasion, Corrie finally joined her sister in thanking God for the fleas.
Several months later, the two sisters expressed their surprise that the camp guards had never come back to their barracks to disrupt or prevent the evening Bible studies they held for their fellow prisoners. It was then that Corrie realized that the very fleas which she had so despised had actually been a God-sent protection from the cruel guards.