In this brief book, Moshe Halbertal analyzes the concepts of religious and secular sacrifice. For religious sacrifice, he examines Hebrew sources and distinguishes between sacrificing "to" a god as a gift versus later notions of sacrificing "for" a cause. In secular contexts, people may sacrifice themselves for a nation or cause. However, misguided self-sacrifice can justify terrible acts by portraying perpetrators as martyrs. While solidarity and obligations to traditions sometimes require sacrifice, prioritizing self-sacrifice over morality can be dangerous.