Ravi Zacharias’ book, Can Man Live Without God?, argues that secular and atheistic worldviews are intellectually and morally insufficient foundations for human existence. The author contends that rejecting a divine creator leads to logical contradictions and a nihilistic void, which historically results in societal decay and ethical collapse. To counter this emptiness, the text explores four essential pillars of a meaningful life: wonder, truth, love, and security. Zacharias posits that these needs are uniquely satisfied through the person of Jesus Christ, who provides a coherent framework for objective reality. By using philosophical analysis, historical examples, and personal anecdotes, the work invites readers to test the exclusive claims of the Christian faith. Ultimately, the sources present a case for theism as the only sustainable source of purpose, morality, and hope in a relativistic world.