John 20:31

Verse 31. These are written. Those recorded in this gospel. That ye might believe, &c. This is a clue to the design which John had in view in writing this gospel. The whole scope or end of the book is to accomplish two objects: 1st. To prove that Jesus was the Messiah; and, 2nd. That they who looked at the proof might be convinced and have eternal life. This design is kept in view throughout the book. The miracles, facts, arguments, instructions, and conversations of our Lord all tend to this.