Wikipedia says:
http://en.wikipedia.org/wiki/Gospel_of_John"John is the gospel of
belief. It was written to convince people to believe that Jesus is the Messiah, the Son of God. John's purpose in writing is expressed in the conclusion, 20:30–31: "…these [Miracles of Jesus] are written that you may (come to) believe that Jesus is the Messiah, the Son of God, and that through this belief you may have life in his name."
As usual, I think we have a lot of assumptions about what those words mean that may cause us to miss the whole point, even while we're reading it. Wikipedia goes on to say
"John focuses on Jesus' mission to bring the Logos ("Word" or "Reason" or "Rationality") to his disciples."
Logos means not just "word" but also "reason" and "rationality."
Logos is the word we tack on to mean "the systematic study of" or "the
science of" - like
biology.
So let's start with these first few metaphysical verses and think about what they might mean.