John 1: Emanuel

How can we know our Creator?

14 The Word became flesh and blood,
    and moved into the neighborhood.
We saw the glory with our own eyes,
    the one-of-a-kind glory,
    like Father, like Son,
Generous inside and out,
    true from start to finish.

Jesus is Emanuel - "God with us". 
John wants to share his testimony - he saw the glory of the Lord through Jesus. 
In John 20 we read:

30-31 Jesus provided far more God-revealing signs than are written down in this book. These are written down so you will believe that Jesus is the Messiah, the Son of God, and in the act of believing, have real and eternal life in the way he personally revealed it.

This reminds me the question of the young rich: "how can I have eternal life?". The answer according to John is "believe that Jesus is the Messiah, the Son of God".

This also reminds me of ICTUS (the symbol of the first Christians, a fish): 
"Iēsous Christos, Theou Yios, Sōtēr," which means "Jesus Christ, Son of God, Savior".

Why is it so important to believe that Jesus is the Messiah, the Son of God? Because, through Him we see the glory of the Father.