This author said that Jesus Christ came with water and blood, not with water only. The Holy Spirit testifies to the truth, because he is truth. These three testify, the Spirit, the water, and the blood, and they all agree. If we accept human testimony, the testimony of God is greater. God has testified about his Son. Those who believe in the Son of God have this testimony in their hearts. However, those who not believe in God have made him a liar. They do not believe his testimony about his Son, that eternal life is with his Son. Anyone who has the Son, also has life. Anyone who does not have the Son, does not have eternal life. He was writing these things so that they might believe in the Son of God and eternal life. Do you believe in eternal life?