The prologue to John’s gospel serves as an introduction to God, not as a person, not as a being, but as the Word: the truth. This is exactly what was emphasized in multiple Old Testament accounts, from Genesis to God revealing Himself as I AM to Moses. God, and thus Jesus, is the Word, is life. He is how everything else is. He is light. When the Word became flesh, His glory, His truth was revealed to us. Jesus was a man, but He was so much more. He is God, He is light, He is truth, He is life. Much like the burning bush shone light and its thorns stood for God suffering for us, so does Jesus in His becoming man to save our souls.