If we accept the testimony of men, the testimony of God is greater, because this is the testimony of God that he has testified concerning his Son.

And this is the testimony: God has given us eternal life, and this life is in his Son.

(The one who believes in the Son of God has the testimony in himself; the one who does not believe God has made him a liar, because he has not believed in the testimony that God has testified concerning his Son.)