What does the Bible say about the purpose of John's Gospel?

The purpose of John's Gospel is explicitly stated as being evangelistic. John writes, 'These are written so that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in His name.' This highlights that the Gospel is not merely a recount of events but a spiritual invitation to encounter Jesus and embrace Him as the source of eternal life. John's Gospel emphasizes the divinity of Christ, showcasing His glory and calling believers to a deep personal faith that results in spiritual life.