Amos 4:10

"'I sent plagues among you as I did to Egypt. I killed your young men with the sword, along with your captured horses. I filled your nostrils with the stench of your camps, yet you have not returned to me,' declares the Lord." NIV translation

Here, the Israelites are reminded of what happens when the favor of God is removed from a nation. Their armies were not able to even keep what they had won in previous battles. It seems that, more than ever, nations are putting their trust in weapons of war without remembering that they are useless without the favor of God.

Amos 4:11

"'I overthrew some of you as I overthrew Sodom and Gomorrah. You were like a burning stick snatched from the fire, yet you have not returned to me,' declares the Lord." NIV translation

Just as with Lot and his family escaping from Sodom, God preserved a remnant through the judgment. The people knew of this story but even so did not repent. The same type of thing will happen again with the 144,00 witnesses in the tribulation. 

Amos 4:12

"'Therefore this is what I will do to you, Israel, and because I will do this to you, Israel, prepare to meet your God.'" NIV translation

Israel was given a period of time where they had the opportunity to repent. Since they did not, they were told to prepare for the judgment of God. For those who do not repent and accept Jesus, the phrase "prepare to meet your God" are the most terrifying words that there can be. We all must ask ourselves if we are prepared and the only way to be ready is by faith in the blood of Jesus Christ.

Amos 4:13

"He who forms the mountains, who creates the wind, and who reveals his thoughts to mankind, who turns dawn to darkness, and treads on the heights of the earth - The Lord God almighty is his name." NIV translation

The prophet, Amos, goes on to describe who God is. In Hebrew, the name God Almighty is El Shaddai which describes an all sufficient God. El comes from the root word that means power or strength and Shad means breast in Hebrew. Like a nursing mother provides for her child, El Shaddai speaks of the fact that God is all powerful and able to provide for His people. He created all things and so is the rightful owner of all things. In this case, it also speaks of the fact that God controls the times and can decide when the time for repentance is past and judgment is to begin.