How we cite our quotes: All quotations are from Blade Runner.
Quote #1
DECKARD: I don't know why he saved my life. Maybe in those last moments he loved life more than he ever had before. Not just his life, anybody's life, my life. All he'd wanted were the same answers the rest of us want. Where did I come from? Where am I going? How long have I got? All I could do was sit there and watch him die.
These next two quotes are both from the voiceover versions of Blade Runner. In this one, Deckard suggests that the reason Batty refused to kill him was because his own impending death made him treasure life more—his own and everyone else's.
Quote #2
DECKARD: I watched him die all night. It was a long, slow thing... and he fought it all the way. He never whimpered, and he never quit. He took all the time he had, as though he loved life very much. Every second of it... even the pain. Then, he was dead.
This voiceover quote doesn't really seem to match up with the movie itself. When Batty releases the dove, this seems to be the moment at which he dies, since the whole thing is chock full of symbolism. Nevertheless, this description shows Batty using his own terrible suffering to affirm life and give it a meaning.
Quote #3
ROY: We've got a lot in common.
SEBASTIAN: What do you mean?
ROY: Similar problems.
PRIS: Accelerated decrepitude.
Sebastian has a disease called "Methuselah Syndrome" which involves aging prematurely. So in this way, he's similar to the replicants, who have a shorter-than-normal lifespan—a mere four years.