Why is understanding eternal life through Christ important for Christians?

The promise of eternal life is a central theme in Christian doctrine and is encapsulated in 1 John 2:25, where it states that God has made a promise of eternal life to believers. This promise is fundamentally tied to one's faith in Jesus Christ as the Son of God. Through knowledge and confession of Christ, believers affirm their relationship with the Father, ensuring that they possess eternal life. Recognizing this truth not only provides assurance but also motivates believers to live out their faith in light of this eternal promise.