Audio commentary on this verse

Note 33 at Ro 8:16: 1Jo 5:10 says, "He that believeth on the Son of God hath the witness in himself." John went on to say in 1Jo 5:13, "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." So the Spirit bearing witness with our spirits is to assure us that we are the children of God (1Jo 3:19).