Why is the concept of eternal life significant in Christianity?

In historic Reformed theology, the concept of eternal life transcends mere longevity; it denotes a quality of life that is found in a relationship with God through Jesus Christ. According to the sermon, Habakkuk's declaration, 'We shall not die,' signifies the promise of eternal life for God's people, rooted in the finished work of Christ. This assurance of salvation means that believers are not subject to the second death, as their sins have been fully atoned for by Christ's blood. Eternal life, therefore, represents not only a future hope but also a present reality, where believers can experience the fullness of life in fellowship with God.