Why is the Book of Life significant for Christians?

The Book of Life contains the names of those who have been redeemed by Christ, signifying God's eternal love and election. Revelation 20:15 warns that those not found in the Book of Life will face the second death—eternal separation from God. For Christians, being written in this book is a source of great comfort and hope, assuring them of their secured salvation in Christ. It reflects a divine assurance that our names are engraved in the eternal plan of redemption before the foundation of the world.