assurance of salvation

as i was doing some personal bible study this morning i was reflecting on this we can have assurance of salvation i john 5;11-13 and this is the record that God hathgiven to us eternal life , and this life is in his son.he that hath his son hath life, and he that hath not the son hath not life. these things have i written unto you that i believe on the name of the son of God that ye may know thT YE HAVE ETERNAL LIFand that ye may believe on the name of the son of God