Answer: The person who hears the Word of Jesus and believes God, Who sent Jesus, has eternal life. That person has crossed over from the eternal death and condemnation of living in the world of sin and darkness to living in the light and life and Truth that is Jesus Christ, (verse 24).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
"HAS eternal life" is what is NOW possessed by the one who hears the Word of Jesus and believes Him Who sent Jesus. Faith (belief) and life (eternal life) are always connected:
John 20:31: "But these [events] are written that you may BELIEVE that Jesus is the Christ, the Son of God, and that by BELIEVING you may have LIFE in His Name."
Romans 5:1-2: "Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ, through Whom we have gained access by faith into this grace in which we now stand. And we rejoice in the hope of the glory of God."
2 Corinthians 6:1-2: "As God's fellow workers we urge you not to receive God's grace in vain. For He says, ‘In the time of My favor I heard you, and in the day of salvation I helped you.' I tell you, now is the time of God's favor, now is the day of salvation."
Ephesians 5:8: "For you were once darkness, but now you are light in the Lord. Live as children of light..."
