10 The one who believes in the Son of God has this testimony within himself. The one who does not believe God has made him a liar,b because he has not believed in the testimony God has given about his Son. 11 And this is the testimony: God has given us eternal life, and this life is in his Son. 12 The one who has the Son has life.c The one who does not have the Son of God does not have life.