Passage
And God set them in the expanse of the heavens, to give light on the earth,
And God set them in the expanse of the heavens, to give light on the earth,
Genesis 1:15 and let them be for lights in the expanse of the heavens, to give light on the earth. And it was so.
Genesis 1:16 And God made the two great lights, the great light to rule the day, and the small light to rule the night, and the stars.
Genesis 1:17 And God set them in the expanse of the heavens, to give light on the earth,
Genesis 1:18 and to rule during the day and during the night, and to divide between the light and the darkness. And God saw that it was good.
Genesis 1:19 And there was evening, and there was morning a fourth day.
The verse centers on "light", "expanse", "heavens", "give", and "earth". It is saying that the verse draws attention to "light" and "expanse", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 16's "And God made the two great lights..." into verse 18's "and to rule during the day and...", so "light" and "expanse" belong inside that flow. In Genesis context, the local focus is creation, human rebellion, covenant promise, and God's providence.
A plain takeaway is to answer the verse's own emphasis on "light" and "expanse" with trust shaped by these words, not by a vague optimism outside the passage.