How we cite our quotes: All quotations are from Thor.
Quote #4
THOR: Sif, you have done all you can!
SIF: No! I will die a warrior's death! Stories will be told of this day!
THOR: Live, and tell those stories yourself!
Thor's pretty much figured it out by now. His job is not to bash the bad guys until they stop twitching, but to protect those who can't protect themselves. In this case, it's Sif: who can darn well take care of herself, but who's hit a bit of a wall when it comes to the Destroyer.
Quote #5
SIF: My King, we would ask that you end Thor's banishment.
LOKI: My first command cannot be to undo the Allfather's last. We're on the brink of war with Jotunheim. Our people need a sense of continuity, in order to feel safe in these difficult times. All of us must stand together, for the good of Asgard.
Here's where the whole sacrifice thing gets put to the test. Loki sounds awfully convincing here, with the "greater good of Asgard" and all. But seriously: he doesn't want Thor back and he's not particularly interested in keeping up with whatever Odin was doing. It's not a sacrifice it you're not actually giving anything up.
Quote #6
ERIK: I've seen the way she looks at you.
THOR: I swear to you, I mean her no harm.
ERIK: Good. In that case, I'll buy you another round, and you'll leave town tonight.
Thor doesn't end up leaving, but we're pretty sure he would have given up Jane (and a shot at returning home) in order to keep her safe. It's an important moment because it's the first time he's thought about someone other than himself.