What was the one thing Corrie learned to fear above all else at Scheveningen in the book The Hiding Place?

I think she feared the Nazis above all else because they gave commands and her cellmates as well as her would follow every command. Also, they knew that if they didn't follow the commands, harsh punishments could happen. Corrie and her cellmates never talked back because they knew the consequences. Lastly, the book shows their fear of the nazis by hiding things like Bibles, gospels, sweaters, personal items, etc.