When Augustus explains Hazel why he keeps an unlit cigarette in his mouth.
“It's a metaphor, see: You put the killing thing right between your teeth, but you don't give it the power to do its killing.”
When Augustus explains Van Houten, what Hazel means to him.
“What else? She is so beautiful. You don’t get tired of looking at her. You never worry if she is smarter than you: You know she is. She is funny without ever being mean. I love her. I am so lucky to love her, Van Houten. You don’t get to choose if you get hurt in this world, old man, but you do have some say in who hurts you. I like my choices. I hope she likes hers.”
When Augustus and Hazel converse with each other.
“As he read, I feel in love the way you fall asleep: slow, and then all at once.”
“My thoughts are stars I can't fathom into constellations.”
“That's why I like you. Do you realize how rare it is to come across a hot girl who creates an adjectival version of the word pedophile? You are so busy being you that you have no idea how utterly unprecedented you are.”
“Come over here so I can examine your face with my hands and see deeper into your soul than a sighted person ever could.”
“I love you present tense.”
When Augustus talks about pain.
“That's the thing about pain. It demands to be felt.”
When hazel explains that she might end up breaking his heart, Augustus says,
“Oh, I wouldn't mind, Hazel Grace. It would be a privilege to have my heart broken by you.”
The last one is how they choose their words which are just too good to be true.
“You gave me a forever within the numbered days and I can't tell you how thankful I am for our little infinity”
There are many more which I can fill in, but I feel these are enough to showcase what the book actually does to you.
For any of you who have read the book and feel I missed out on some better lines (which I’m sure I did) do not hesitate in letting me know.