We accept human testimony, but God’s testimony is greater because it is the testimony of God, which he has given about his Son.
Whoever believes in the Son of God accepts this testimony. Whoever does not believe God has made him out to be a liar, because they have not believed the testimony God has given about his Son.
And this is the testimony: God has given us eternal life, and this life is in his Son.
Whoever has the Son has life; whoever does not have the Son of God does not have life.