Passage
God set them in the expanse of the sky to give light to the earth,
God set them in the expanse of the sky to give light to the earth,
Genesis 1:15 and let them be for lights in the expanse of the sky to give light on the earth”; and it was so.
Genesis 1:16 God made the two great lights: the greater light to rule the day, and the lesser light to rule the night. He also made the stars.
Genesis 1:17 God set them in the expanse of the sky to give light to the earth,
Genesis 1:18 and to rule over the day and over the night, and to divide the light from the darkness. God saw that it was good.
Genesis 1:19 There was evening and there was morning, a fourth day.
The verse centers on "light", "expanse", "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 "God made the two great lights the..." into verse 18's "and to rule over 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.