Christian Shephard: "I know I have been hard on you, but that is how you make a soft metal into steel. That is why you are the most gifted young surgeon in this city. And this... this is a career that is all about the greater good. I've had to sacrifice certain aspects of my relationship with you so that hundreds and thousands of patients will live because of your extraordinary skills. I know it's a long... long time coming. What happened yesterday, I promise you will never happen again. And after all... what I've given... this is... this is not just about my career, Jack. It's my life."
Locke: "Boone was a sacrifice that island demanded. What happened to him at that plane was a part of a chain of events that led us here... that led us down a path, that led you and me to this day, to right now."
Desmond: "Moriah is the mountain where Abraham was asked to kill Isaac."
Brother Campbell: "And yet God spared Isaac." Desmond: "Well one might argue that God need not have asked Abraham to sacrifice his son in the first place." Brother Campbell: "Well then it wouldn't have been much of a test, would it Brother? Perhaps you underestimate the value of sacrifice."
While traveling to the helicopter along with Jack, Hurley, Kate, Sayid and Sawyer, Frank notices that they're losing fuel very quickly. Frank suggests to dump everything they don't need from the helicopter. The survivors do so, but Frank claims he'll "feel a hell of a lot better if we lost a few hundred pounds." After realizing nobody is wants to leave, Sawyer whispers to Kate something that sounds like "I have a daughter in Alabama. You have to find her and tell her I'm sorry. She asks why is he telling her this, Sawyer then kisses her and jumps from the helicopter, sacrificing himself so that the other survivors can make it back to the freighter.
Jack puts the stone plug back to restore the golden light exposing himself to the electromagnetism at the Source, as he realizes that this is destiny. He dies in the bamboo grove after assuring the survival of his friends and their escape from the island.