Why is the second death significant for Christians?

The significance of the second death is that it represents eternal condemnation, which is the consequence of sin. Revelation 20:6 assures believers that the second death has no power over those who partake in the first resurrection. This assurance stems from the redemptive work of Christ, who bore our sins and secured our pardon, as stated in Isaiah 40:2. For Christians, the reality of Christ's sacrifice means that they are spared from the judgment associated with the second death, allowing them to have eternal life with God.