“You can't have a happy life and an unhappy relationship - it's a contradiction.”

“So you're trying to make her happy despite the fact that the reason she's unhappy in the first place is you," said Simon, not very kindly. "That seems contradictory, doesn't it?"
"Love is a contradiction," said Jace.”

“Whether happy or unhappy, life is the only treasure man possesses”

“It is the law of life that if you are kind to someone you feel happy. If you are cruel you are unhappy. And if you hurt someone, you will be hurt back.”

“A woman had to choose her own particular unhappiness carefully. That was the only happiness in life: to choose the best unhappiness. An unwise move, good God, you could squander everything.”

“They've got no idea what happiness is, they don't know that without this love there is no happiness or unhappiness for us--there is no life.”

“They say that extroverts are unhappier than introverts and have to compensate for this by constantly proving to themselves how happy and contented and at ease with life they are.”

“You are unhappy because you believe in such a thing as happy.”

“It's what's inthat makes you happy or unhappy.”

“Well, I'd rather be unhappy than have the sort of false, lying happiness you were having here.”