“And this is the testimony: God has given us eternal life, and this life is in his Son. The one who has the Son has this eternal life; the one who does not have the Son of God does not have this eternal life.”
1 John 5.11-12
Eternal life is the life that God possess in all its beautiful qualities. It can be found and possessed by man. Only in his Son can we have it, for the Son is God. Outside of him there is no life.
To enter into the Son, we must be immersed in water for the forgiveness of sins. Have I done that? To remain in him is to continue hearing and obey the teaching of Christ, 1 Jn 2.24. Am I doing that?