I knew that time would now pass for me differently than it would for him - that I, like everyone in that room, would go on accumulating loves and losses while he would not. And for me, that was the final and truly unbearable tragedy: Like all the innumerable dead, he'd once and for all been demoted from haunted to haunter.

Dude, you're such a geek. And that's coming from an overweight Star Trek fan who scored a 5 on the AP Calculus test. So you know your condition is grave

I was thinking about the universe wanting to be noticed, and how I had to notice it as best I could. I felt that I owed a debt to the universe that only my attention could repay, and also that I owed a debt to everybody who didn’t get to be a person anymore and everyone who hadn’t gotten to be a person yet.

The act of leaning in to kiss someone, or asking them, is fraught with the possibility of rejection, so the person least likely to get rejected should do the leaning in or the asking.

What is an "instant" death anyway? How long is an instant? Is it one second? Ten? The pain of those seconds must have been awful as her heart burst and her lungs collapsed and there was no air and no blood to her brain and only raw panic. What the hell is instant? Nothing is instant. Instant rice takes five minutes, instant pudding an hour. I doubt that an instant of blinding pain feels particularly instantaneous.

I want more numbers than I’m likely to get, and God, I want more numbers for Augustus Waters than he got. But, Gus, my love, I cannot tell you how thankful I am for our little infinity. I wouldn’t trade it for the world. You gave me a forever within the numbered days, and I’m grateful.

Some wars," he said dismissively. "What am I at war with? My cancer. And what is my cancer? My cancer is me. The tumors are made of me. They're made of me as surely as my brain and my heart is made of me. It is a civil war, Hazel Grace, with a predetermined winner.