How to know you have eternal life:
1Jn 5:9  If we receive the witness of men, the witness of God is greater: for this is the witness of God which he hath testified of his Son. 
1Jn 5:10  He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son. 
1Jn 5:11  And this is the record, that God hath given to us eternal life, and this life is in his Son. 
1Jn 5:12  He that hath the Son hath life; and he that hath not the Son of God hath not life. 

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