“Surely the Sovereign Lord does nothing without revealing his plan to his servants the prophets” (Amos 3:7, NIV).
This is what the book of Amos is: God, the Sovereign Lord revealing his plan for the people of Israel, his chosen and adopted people, his family that he redeemed out of slavery and bondage with great power and a mighty hand. He brought them up out of Egypt, led them for forty years through the desert, and settled them in the place he had prepared for them. Here in this Promised Land he would be their God and they would be his people.
But now God is saying because you are my chosen family, my treasured possession, “I will punish you for all your sins” (Amos 3:2, NIV).
“For three sins of Judah, even for four . . . For three sins of Israel, even for four, I will not turn back my wrath.” (Amos 2:4,6, NIV). The patience of the Lord has reached its limit.
In a cultural climate of affluence, leisure, and ease God’s children have “rejected the law of the Lord and have not kept his decrees . . . they have been led astray by false gods” (Amos 2:4, NIV). They are more concerned for things than they are for people: “They sell the righteous for silver, and the needy for a pair of sandals.
They trample on the heads of the poor” (2:6-7); they indulge in sexual immorality, “father and son use the same girl” (2:7); there is no appetite for the word of God, as they “commanded the prophets not to prophesy” (2:12). “They do not know how to do right… who hoard plunder and loot in their fortresses” (palatial dwellings) (3:10).
God promises judgment: “I will send fire . . . that will consume the fortresses” (2:5); “I will crush you” (2:13); “an enemy will overrun the land; he will pull down your strongholds and plunder your fortresses” (3:11); “I will tear down the winter house along with the summer house; the houses adorned with ivory will be destroyed and the mansions will be demolished . . . ” (3:15); they will “go into exile; your feasting and lounging will end” (6:7).
All these words became reality. Does God speak and not act?
Yet as God’s word through Amos unfolds, we will see that with his word of judgment also comes an inviting word of grace. He repeatedly implores his people to “return to me… seek me and live.”
“Amos stands as a warning against separating our worship from our lifestyle. We need to understand that ‘social justice’ is a misnomer because unfaithfulness is a social outcome of covenant unfaithfulness, not a social issue or problem.” 
Yet we can stand eternally grateful that God has ultimately solved the problem of our injustices (and the much deeper problem of our sin and self-serving) with a glorious injustice of his own: “For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God” (2 Cor. 5:21, ESV).
With Jesus having paid the penalty of our sin, the Gospel frees us to love God and love our neighbor with joy, seeking justice, and respecting the dignity of every human being (BCP p.305).
 Fran Sciacca, Getting the Big Picture: Acts 1-3 of God’s Grand Drama.