John 20:30 – 31
New International Version (NIV1984)
30 Jesus did many other miraculous signs in the presence of his disciples, which are not recorded in this book. 31 But these are written that you may[a] believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name.
From BibleGateway.com: http://www.biblegateway.com/passage/?search=John 20:30 – 31&version=NIV1984