How do we know that Christians are destined for eternal life?

The assurance of eternal life for Christians is firmly rooted in the promises of Scripture, emphasizing that those who are truly in Christ are sealed by the Holy Spirit—a mark of our belonging to God. Revelation 14 depicts believers as those who follow the Lamb, demonstrating their faithfulness, and as a consequence, they are promised rest from their labors and eternal communion with God. This eternal hope is not based on our merit but on His unfailing promise and grace, affirming that our names are written in the Book of Life, guaranteeing our destiny with Him.