Passage
And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Genesis 1:3 And God said, Let there be light: and there was light.
Genesis 1:4 And God saw the light, that it was good: and God divided the light from the darkness.
Genesis 1:5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Genesis 1:6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
Genesis 1:7 And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so.
The verse centers on "called", "light", "darkness", "night", "evening", "morning", and "first". It is saying that the contrast between light and darkness marks a real divide in how people respond to God's work.
The nearby context moves from verse 4's "And God saw the light that it..." into verse 6's "And God said Let there be a...", so "called" and "light" belong inside that flow. In Creation Begins, the local focus is creation, God's sovereignty, the Spirit's presence, and light.
A plain takeaway is to answer the verse's own emphasis on "called" and "light" with trust shaped by these words, not by a vague optimism outside the passage.