He was in the world, and though the world was made through him, the world did not recognize him.
Its amazing that this verse explains that the Creator came into this World in the form of a man. The Messiah from Heaven walked like the Son of man. Performing astonishing miracles, still many people refused to believe in Him. This had to happen. If all had believed in Him, the World would not have crucified him. The blood of the Lamb of God had to be shed, to save us from our sins.