Final answer:
Von Galen's sermon was a famous sermon delivered by Clemens August Graf von Galen during World War II, where he criticized the Nazi regime and its euthanasia program.
Step-by-step explanation:
Von Galen's sermon refers to a famous sermon delivered by Clemens August Graf von Galen, a German bishop, during World War II. In his sermon, von Galen denounced the Nazi regime and its euthanasia program, which involved the killing of people with disabilities. Von Galen's sermon gained widespread attention for its bold criticism of the Nazi government and its defense of human dignity. His words were seen as a powerful resistance against the oppressive regime.