Amos is a very depressing book. It is pretty much 9 chapters of judgement, with a little bit of hope in the last 5 verses. The book starts out with judgements against Foreign nations, but moves to Amos' mission field: Israel, the northern kingdom. He has some very stern words for these people. He rebukes them for their sin, particularly their excessive living and taking advantage of the poor. Over and over again God announces his judgement over the sins of Israel.
In fact, Amos' message was so aggressive, Amaziah the priest of Bethel tells Amos to go away and bother Judah (7:12). Amos is not very popular. His message is filled with harsh judgement from God, and Israel did not want to hear it. They were prosperous. They were comfortable. Why then do they need God? Why would they want to listen to Amos?
The book of Amos serves as a strong warning to the rampant American materialism in our culture. Read the book and you will observe that the northern kingdom sounds alot like the USA:
"Woe to those who lie on beds of ivory and strech themselves out on their couches, and eat lambs from the flock and calves from the midst of the stall, who sing idle songs to the soundof the harp..." Amos 6:4ff
This excessive living and comfort is disturbing to God. I don't think that prospeterity and comfort are bad things, but Israel seems to have made them into ultimate things. America has done the same. We roam around seeking possessions, comfort, and ease. We have prosperity, but we don't use it to serve the poor or advance the Gospel. We use it to buy rib-eye steaks or a bigger TV. This American greed has become so thick in our vains, that we don't even realize it effects our every thought. It informs our every discision.
A Christian is not to live for comfort and ease, but to sacrifice all things for the sake of Jesus. We are called to lay all things down, pick up our cross, and follow Jesus. The Spirit must purge every ounce of materialism that runs through our veins, and we must submit our lives to the Lordship of Christ. We are the richest nation in the world, and to whom much is given, much is expected. Therefore, let our treasure not be found in this world, but in the Lord Jesus.