Reading
1 Samuel 3:1 And the boy Samuel ministered to the LORD before Eli. Now in those days the word of the LORD was rare and visions were scarce.
we notice a key thing, something we also see in other places in the bible:
That God uses dreams and visions very often (more than other ways) to communicate to us, to give word/direction to his people.
Some visions have also Spoken Words from God, such as the vision in Acts 10, where the vision is a combination of seen images
and spoken words, both.
11 He [Peter] saw heaven opened and something like a large sheet being let down to earth by its four corners.
12 It contained all kinds of four-footed animals, as well as reptiles and birds.
13 Then a voice told him,
“Get up, Peter. Kill and eat.”
14 “Surely not, Lord!” Peter replied. “I have never eaten anything impure or unclean.”
15The voice spoke to him a second time,
“Do not call anything impure that God has made clean.”
(Notice the vision recipient does not initially understand --)
16 This happened three times, and immediately the sheet was taken back to heaven.
17 While Peter was wondering about the meaning of the vision, the men sent by Cornelius found out where Simon’s house was and stopped at the gate.
Acts 10 NIV
But also in a dream a meaning sometimes will be given or come across also, communicated to us without spoken words somehow. (I know this first hand)
So, there are visual scenes in a vision, but also sometimes communicated meaning (that the recipient sometimes somehow understands an intended meaning, even without audible words), and then in some special visions, there are even audible spoken words. These are rare and special visions it seems, these that have audible words.
Now, as we all already realize, the recipient of the Genesis 1 revelation would not be able to himself be there in person during creation(!)....
Of course he lived much later than the time of creation...
So, to understand even a little, even just partially, this amazing and unexpected revelation, he would be given we can expect visual revelation (visually seen scenes just like Peter had in Acts 10), along with probably communicated partial understanding (we never understand 100% of everything in a vision right off the bat), and finally in this very special vision of revelation, also the Spoken Words of God.
Genesis 1:3 And God said, "Let there be light," and there was light.
!
Genesis 1:9 And God said, "Let the waters under the sky be gathered into one place, so that the dry land may appear." And it was so.
!
What an amazing vision this was, and what an amazing blessing to receive it.