John was one of the apostles who walked with Jesus on this earth. Jesus considered him as his beloved disciple (John 13:23). John was one of the sons of Zebedee and the brother of James, the apostle.

The book of John is believed by some to have been written before the destruction of Jerusalem in 70 AD, but it is widely accepted by theologians to have been written around 85-90 AD. It stands out as the most theological of the four gospels, with recurring words and themes such as believe, witness, Comforter, life-death, light-darkness, I Am, and love, all of which hold significant theological implications.

This book of John starts by presenting Jesus as the Word of God that became flesh, demonstrating His power through performing miracles. John's purpose in this book was to showcase Jesus' deity and correct the false doctrine circulating that the Christ-Spirit came upon Jesus when He was baptized and later left Him when He was crucified. We know that Jesus was fully God and fully man.