Before creation, formless void and darkness — the Spirit hovering. John confirms the Word was present in this pre-creation moment. Not created, but there. The Triune God already in motion.
"God said" = the Word spoke. John makes explicit what Genesis implies: the speech act of creation was through the Word. Nothing exists that wasn't made through Him.
God separates light from darkness — a physical act foreshadowing a spiritual reality. The life in the Word becomes the light of all humanity. A cosmic event becomes a personal promise.
Genesis ends day one. John leaps forward: the light still shines — and every force of darkness in all of history has failed to extinguish it. The first day becomes the promise for every day.
Both open "In the beginning." Genesis shows what God did. John reveals who was there — the Word. The cosmos wasn't created by a force; it was spoken by a Person.