John, the son of Zebedee, and one of the twelve disciples of Jesus Christ is thought to have been the author of this book. His gospel is different by nature from the other three. It is an interpretation of the facts of Jesus' life rather than a presentation of its facts in historical sequence. His purpose in writing is unique, as is his interpretation of the life of Jesus. He emphasizes the deity of Jesus, as well as focuses on the words "signs" (miracles), "believe", and "life". John's gospel is evangelistic and written so others might believe. He also writes for the believers that they may be sanctified, as he speaks of the promise of the Holy Spirit, the truth that Jesus is the True Vine, and Simon Peter's denial and restoration. Most think this was the last gospel to be written, perhaps while the "beloved disciple" of Jesus Christ was at Ephesus about A.D. 85.