Sometimes credited to Jack Kerouac, from his book The Dharma Bums. It is not a quote by Kerouac. It first appeared as a very brief description of The Dharma Bums in Esquire's list of "The 80 Best Books Every Man Should Read" in 2010: http://www.esquire.com/entertainment/books/g96/80-books/?slide=71. It was later copied by Kilburn Hall in his list of 30 "Books and Authors Every Man Should Read" which he first posted online in 2012: https://kilburnhall.wordpress.com/2012/03/17/the-books-and-authors-every-man-should-read/
Misattributed

“Here's to the crazy ones. The misfits. The rebels. The troublemakers. The round pegs in the square holes. The ones who see things differently. They're not fond of rules, and they have no respect for the status quo. You can quote them; disagree with them; glorify or vilify them. About the only thing you can't do is ignore them. Because they change things. They push the human race forward. And while some may see them as the crazy ones, we see genius. Because the people who are crazy enough to think they can change the world are the ones who do.”

Jack Kerouac

Used in the Apple "Think Different" marketing campaign and sometimes attributed to Kerouac on the internet, perhaps because it evokes his famous quote from On the Road: "The only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved, desirous of everything at the same time, the ones who never yawn or say a commonplace thing, but burn, burn, burn, like fabulous yellow roman candles exploding like spiders across the stars and in the middle you see the blue centerlight pop and everybody goes "Awww!"" The original script was actuality written by Rob Siltanen with participation of Lee Clow. In "The Real Story Behind Apple's 'Think Different' Campaign" in Forbes (14 December 2011) http://www.forbes.com/sites/onmarketing/2011/12/14/the-real-story-behind-apples-think-different-campaign/ Rob Siltanen states: "I wrote everything..." "I shared my scripts with Lee, and he thought they were good. He made a couple tweaks..." <br class="br">Misattributed

“If moderation is a fault, then indifference is a crime.”

Jack Kerouac

Not a Kerouac quote, but by Georg Christoph Lichtenberg (1742-1799), the German scientist, satirist, and Anglophile: http://www.quotes.net/quote/58450
Misattributed

“His friends said, "Why do you have that ugly thing hanging there?" and Bull said, "I like it because it's ugly." All his life was in that line.”

Jack Kerouac book On the Road

Source: On the Road

“Be in love with your life. Every minute of it.”

Jack Kerouac

"Belief & Technique For Modern Prose: List of Essentials" in a letter to Arabelle Porter (28 May 1955); published in Jack Kerouac: Selected Letters 1940-1956 (1995). Sometimes misquoted as "Be in love with your life every minute of it."
Variant: Be in love with your life every detail of it

“Listen to the silence inside the illusion of the world”

Jack Kerouac

Letter to Edith Parker Kerouac (28 January 1957); published in Jack Kerouac: Selected Letters 1957-1969 (1999)

“Will you love me in December as you do in May?”

Jack Kerouac

“My manners, abominable at times, can be sweet. As I grew older I became a drunk. Why? Because I like ecstasy of the mind. I'm a wretch. But I love, love.”

Jack Kerouac book Satori in Paris

Satori in Paris (1966)

“They have worries, they're counting the miles, they're thinking about where to sleep tonight, how much money for gas, the weather, how they'll get there - and all the time they'll get there anyway, you see.”

Jack Kerouac

Source: On the Road: the Original Scroll

“Pain or love or danger makes you real again….”

Jack Kerouac book The Dharma Bums

Source: The Dharma Bums

“I'm writing this book because we're all going to die”

Jack Kerouac book Visions of Cody

In the loneliness of my life, my father dead, my brother dead, my mother far away, my sister and my wife far away, nothing here but my own tragic hands that once were guarded by a world, a sweet attention, that now are left to guide and disappear their own way into the common dark of all our death, sleeping in me raw bed, alone and stupid...
Visions of Cody (1960)