One verse I loved today was Amos 6:8 which starts out with "The Lord God has sworn by himself.." When we swear (which we shouldn't do), we say, "I swear to God!" God has no one higher to swear by, so he just swears to himself. Awesome!
Amos 9:11 is quoted in Acts 15:16 when a special council is called in Jerusalem (aka - The Jerusalem Council) to discuss whether or not the Gentile converts are to abide by some of the old Jewish traditions/laws. James, the brother of Jesus, reminds everyone that Amos prophecied long ago that when God "restores the house of David" the Gentiles would be included in that restoration. (Lucky for us!)