"He who made the Pleiades and Orion, who turns midnight into dawn and darkens day into night, who calls for the waters of the sea and pours them out over the face of the land - the Lord is his name." NIV translation
Amos reminds the people of God's power and the fact that He sustains all of creation. He makes the days and the nights as well as bringing the rains. This is a reminder to us, as well, that God is active in the world and is in control. That will be even more important as the last days draw to a close.
"With a blinding flash he destroys the stronghold and brings the fortified city to ruin." NIV translation
God is not only in control of the natural things of creation but also the affairs of men. Amos reminds them and us that it is God who allows nations to be established and it is God that judges them. He does this on an individual basis as well. The fortified city speaks of the fact that Israel was hiding behind their religion and were not afraid of being judged.
Sadly, there are many today who are hiding in and behind a religion. We are reminded that, in the last days, Jesus will separate the sheep from the goats. The sheep are the ones that have a relationship with Him while the goats are not even related.
"There are those who hate the one who upholds justice in court and detest the one who tells the truth." NIV translation
This verse speaks to the fact that there were those who thought that the people were doing enough to keep God happy by going through the motions of religion. They also hated the messengers (prophets) that told them the truth.
This seems to be even more fitting today as there are even Christians who think that we should all just get along with the religions of the world. They will go so far as to say that we are all going the same place just in a different method. This is a lie from the depths of hell and they hate anyone that will stand on the truth that Jesus is the Son of God and the only way to a right relationship with God.
"'You levy a straw tax on the poor and impose a tax on their grain. Therefore, though you have built stone mansions, you will not live in them, though you have planted lush vineyards, you will not drink their wine.'" NIV translation
We can see that our treatment of the poor can tell us much about our faith in God. As we see here, the rich were going through their religious rituals but abusing the working man in their dealings. They were building up treasured possessions on the earth instead of depositing treasures in heaven. For more on this, see our meditation titled: What's it worth? The largest of mansions on the earth are but a tent compared to our home with Jesus.