Renewal

After finishing Amos, I realized that the prophets speak out about a lot of doom and gloom, but they usually end in restoration and renewal for the people of God.  God's love for us is so strong that he will care for us and restore us even after we commit grievous sins.  While a lot of the prophets' audiences seemed to be stuck on the imminent judgment, we can look back and see how God worked through that to restore Israel time and again.  God truly does have unconditional love for his people.

What version of the bible do we have?

Key verse
John 17:3 - Now this is eternal life: that they may know you, the only true God, and Jesus Christ, whom you have sent.

Amos
In Amos, we see an example of how we have the Old Testament based on the Masoretic text (Hebrew version), whereas the first century church had the Old Testament from the Septuagint (Greek version).  Amos 5:25-26 reads rather differently than Acts 7:42-43, but if you follow the footnoting in your bible, you'll see that in fact, if we read the Septuagint version of Amos 5, the wording will be much the same as that in Acts 7.  Stephen, the fellow who was quoting from Amos, was not confused about what the Old Testament said.  In fact, he knew it quite well, only in Greek!

For three sins or four

Amos
I read somewhere about this passage in Amos.  Amos is listing off a number of foreign places, describing God's judgment that will be meted out upon them.  Each new place gets a little closer to home, however, and Amos' audience must have been getting a little more anxious as they heard about Damascus, then Gaza, Tyre, Edom, Ammon, Moab, and then, what?  Judah and Israel?  Yes, God was going to judge them for their sins as well.  Don't take God's grace for granted or as a free ticket to sin with impunity.