God has provided a wonderful gift of eternal life to humanity. How can we receive this gift? By accepting Godís testimony about His Son and keeping His commandments. Johnís discussion on faith in Jesus and who Jesus is and why we can accept Godís testimony is not an academic exercise. It has a clear, practical goal Ėfinding eternal life in the Son of God.
Johnís opponents who questioned the true divinity of Christ had a different view of Jesus and did not believe in Him in the biblical sense. Because they did not believe Jesus of Scripture, they did not have eternal life even if they would claim to have it, even if they had superior knowledge and a good feeling about possessing eternal life. Better have Jesus and believe in him so that we can have everlasting life.