“Jesus performed many other signs in the presence of his disciples, which are not recorded in this book. But these are written that you may believe that Jesus is the Messiah, the Son of God, and that by believing you may have life in his name.” (John 20:30-31)
In the 20th chapter of John’s gospel, the Apostle gives us the reason for why he wrote. John writes that Jesus performed many other signs while he was here. He even goes so far at the end of the gospel to say that had every one of the things that Jesus did been written down, the world would not have enough room to contain all of the books that were written.