In this verse, the apostle John emphasizes the certainty and importance of the Christian testimony about Jesus Christ. The apostles, including John himself, were eyewitnesses to the life, death, and resurrection of Jesus. They testify to the truth that God the Father sent His Son, Jesus, to be the Savior of the world. This is a central tenet of Christian belief, underscoring the universal scope of Jesus' mission. He came not just for a select few, but for all humanity, offering salvation and reconciliation with God.
The verse reassures Christians of the authenticity of their faith, rooted in the direct experiences and testimonies of those who walked with Jesus. It also highlights the love and initiative of God the Father in sending His Son, demonstrating His desire for all people to be saved. This message of hope and redemption is meant to inspire believers to share their faith and live in the light of this transformative truth. It calls Christians to remember the profound impact of Jesus' life and to bear witness to His saving grace in their own lives.