1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through him, and without him was not any thing made that was made. 4 In him was life, and the life was the light of men. 5 The light shines in the darkness, and the darkness has not overcome it.
—John 1:1–5 (ESV)

As you prepare to board the gospel of John the pilot hands you a special piece of carry-on luggage necessary for a proper flight. Don’t stow it in the overhead bin. Do not put it under the seat. This carry-on luggage is carry-through luggage. Hold on to it tightly throughout the flight. John’s prologue (1:1–18), especially the first five verses, and supremely the first verse, are your carry-through luggage. The Methodist theologian C.K. Barrett has this travel advice, “John intends that the whole of his gospel shall be read in the light of this verse. The deeds and words of Jesus are the deeds and words of God; if this be not true, the book is blasphemous.”
When John hails Jesus as “the Lamb of God,” don’t forget that the Lamb is the Word who was in the beginning. When Jesus cleanses the temple, don’t forget that He is the Word who was with God in the beginning. When Jesus tells Nicodemus that he must be born again, don’t forget that He is the Word who was and is God. When Jesus speaks with the Samaritan woman at the well, don’t forget that He is the Word who became flesh.
Carry the beginning with you through to the end. But also, go to the end to carry it with you from the beginning. This gospel, like all the gospels, must be read backwards. You really must read any one of them twice to really have read them once, for they must be read in light of the ending. Martin Kähler, a critical theologian, is famous for his statement concerning Mark’s gospel, which has sense been applied to all of them. They are all of them, in his words, “passion narratives with extended introductions.” The last days of Jesus’ life are roughly the subject of between a quarter and a third of the synoptics. This is amplified in John. The second section of this gospel, beginning in chapter 13, is known as the “book of glory” or the “book of the Passion.” Near half of John’s gospel concerns His last days from the Passover forward.
But it is also at the end of this gospel that John makes explicit his purpose in writing. “Now Jesus did many other signs in the presence of the disciples, which are not written in this book; but 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” (John 20:30–31). Do you see all the parallels there with John’s prologue? This book is written so that you might believe that Jesus is the Christ, the Son of God, and from the beginning, John wants you to know this critical aspect of that confession:
In the beginning was the Word, and the Word was with God, and the Word was God.