How do we know the resurrection life is promised to believers?

The assurance of resurrection life for believers is grounded in the reality of Christ's resurrection and our intimate connection with Him. In Ephesians 2:6, we read that God 'raised us up together with Christ.' This implies that just as Christ was raised from the dead, so too will all who are united with Him experience this resurrection. The promise is that those who are quickened by the Spirit will not remain in their spiritual tombs, but will be brought into a new life, reflecting the victory over sin and death that Christ achieved.