Questions like "Is it biblical for a Christian to use lethal force in self‑defense?", "Should believers serve in the military or law enforcement?", and "Is all killing wrong?" are often debated among Christians. Unfortunately, these discussions are frequently driven more by emotion than by careful attention to Scripture. Yet the Bible provides clear principles that, when considered together, form a solid framework for addressing these issues. Any biblical discussion of self‑defense or pacifism must begin with Jesus' teaching in Matthew 16:24–25. There. He declares that those who try to save their own lives will lose them, and those who willingly lose their lives for His sake will find them. Although Jesus' primary focus is eternal life, this principle also shapes the Christian's approach to personal safety, sacrifice, and the use of force. In other words, before we can talk about defending life, we must first understand how Christ calls us to value life—our own and others'—in light of the cross.