Passage
For, lo, he that formeth the mountains, and createth the wind, and declareth unto man what is his thought, that maketh the morning darkness, and treadeth upon the high places of the earth, The LORD, The God of hosts, is his name.
Amos 4:13 (KJV)
Nearby Context
Amos 4:11 I have overthrown some of you, as God overthrew Sodom and Gomorrah, and ye were as a firebrand plucked out of the burning: yet have ye not returned unto me, saith the LORD.
Amos 4:12 Therefore thus will I do unto thee, O Israel: and because I will do this unto thee, prepare to meet thy God, O Israel.
Amos 4:13 For, lo, he that formeth the mountains, and createth the wind, and declareth unto man what is his thought, that maketh the morning darkness, and treadeth upon the high places of the earth, The LORD, The God of hosts, is his name.
Study Lenses
The verse centers on "darkness", "formeth", "mountains", "createth", "wind", "declareth", "thought", and "maketh". It is saying that the verse draws attention to "darkness" and "formeth", so its meaning should be read from those terms before moving to application.
The prior verse says "Therefore thus will I do unto thee...", giving immediate footing for "darkness" and "formeth". In Amos context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "darkness" and "formeth" with trust shaped by these words, not by a vague optimism outside the passage.