For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the scriptures might have hope (confident assurance). Romans 15:4

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 (continue to) believe on the name of the Son of God. I John 5:13

But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name. John 20:31

….let the word of Christ dwell in you richly….