For the past 25 years I have had a deeper interest in the four gospels than in my preceding years of adult engagement with faith, theology and spiritual life in Christ.
Among questions significant for me to explore has been the question of the relationship with John's Gospel to the Synoptic Gospels. (That is, to Matthew, Mark, and Luke which have their own differences from each other, but have much common material, and essentially present Jesus in a similar manner, as a wandering Galilean rabbi who is only engaged with Jerusalem at the end of his life.)
There are many differences between John and the Synoptics - so many that many scholars think John's Gospel was composed without knowledge of the other three gospels. My own estimation is that, actually, John did know at least one of the other gospels well, and is precisely different because he chooses to be different - different through theological/christological/pneumatological development of ideas and themes in the Synoptic Gospels so that a deeper meaning or (taking up an ancient word used to describe John's Gospel in distinction from the other gospels) or a spiritual meaning is presented in John's narration of the story of Jesus' life and teaching.
Some of this development is pretty obvious as we read through John's Gospel. For instance, within John 3 we encounter the last times the phrase "the kingdom of God" is used, henceforth to be replaced by the phrase "eternal life." In John 6 there is teaching on the meaning of the bread and wine of communion to an extent and to a depth found nowhere in the Synoptics. Throughout the whole Gospel, the meaning of the relationship between Jesus the Son and God the Father is a recurring theme, presented in a variety of ways, well beyond any talk in the Synoptics of Jesus as "the Son of God", God as "Father" or "Our Father", and Son in relationship to Father and vice versa. The whole of the Gospel of John, from the perspective of Father/Son is a development of a verse common to Matthew and Luke (Matthew 11:27/Luke 10:22).
Recently I thought of another shift. (I am not claiming to be the first to have thought of this shift - only claiming it is the first time I have thought of this particular shift.)
That shift is from Jesus talking in ways which categorise his disciples as "servants" (we could think, for instance, of passages such as Mark 10:33-37 // Matthew 18:1-5 // Luke 9:46-49; Matthew 25:14-30 // Luke 19:11-27) to "friends" (John 15: 13-15). This shift is reinforced by Jesus having special friends: Lazarus (John 11:3, 11) and "The Beloved Disciple" (John 13:23 etc).
This shift to talk of the disciples in more intimate human relationship terms than "servant" is at one with the themes in John's Gospel of the intimacy between God and Jesus (Father/Son) and the role of the Spirit as indwelling the disciples.
And, for me personally, I have been gently challenged: do I think of myself as a "friend" of Jesus (and vice versa) rather than as a "servant"?
