1 John 5:11-13

11. And this is the record, that God hath given to us  eternal life, and this life is in his Son.
12. He that hath the Son hath life; and he that hath not the Son of God hath not life.
13. These things have I written unto you that believe on the name of the Son of God;  that  ye may know that ye have eternal life , and that ye may believe on the name of the Son of God.

1 John 5:11 And the testimony is this: God has given us eternal life [we already possess it], and this life is in His Son [resulting in our spiritual completeness, and eternal companionship with Him]. 12 He who has the Son [by accepting Him as Lord and Savior] has the life [that is eternal]; he who does not have the Son of God [by personal faith] does not have the life.