Quotes about happiness
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Lexie Darnell, Chapter 13, p. 205
Source: 2000s, True Believer (2005)
Context: In her new, more mature incarnation, she embraced the idea that maturity meant thinking about risk long before you pondered the reward, and that success and happiness in life were as much about avoiding mistakes as making your mark in the world.

Source: I Feel Bad about My Neck: And Other Thoughts on Being a Woman

“Happiness is a prison, Evey. Happiness is the most insidious prison of all.”
Variant: Happiness is the most insidious prison of all.
Source: V for Vendetta (1989)
Source: English, August: An Indian Story

“He never felt lonliness except when he was happy.”
Source: Atlas Shrugged

“The nicest thing about feeling happy is that you think you'll never be unhappy again.”
Source: Kiss of the Spider Woman and Two Other Plays

“Man never thinks himself happy, but when he enjoys those things which others want or desire.”

“I don't want to be stinky poo-poo girl, I want to be happy flower child.”

“I am both happy and sad at the same time, and I'm still trying to figure out how that could be.”
Variant: So, this is my life. And I want you to know that I am both happy and sad and I'm still trying to figure out how that could be.
Source: The Perks of Being a Wallflower

Lord Meher http://www.lordmeher.org/index.jsp?pageBase=page.jsp&nextPage=6742, by Bhau Kalchuri, pp. 5770, 5970, 6742. The famous Bobby McFerrin song was based on this phrase often used by Meher Baba.
Variants:
Don't Worry; be Happy! Remember Me; I will help you.
As quoted in Showers of Grace (1984) by Bal Natu, p. 92
Do your best, then don't worry, be happy. Leave the rest to me.
As quoted in The Homeopathic Revolution : Why Famous People and Cultural Heroes Choose Homeopathy (2007) by Dana Ullman, p. 367.
General sources
Variant: Don't worry, be happy.

“But somethings in life are more important than being happy. Like being free to think for yourself.”
“Truly happy memories always live on, shining. Over time, one by one, they come back to life.”
Source: Kitchen (1988)

“Tell me of a happy memory, Zarek. One thing in your life that was good. (Astrid)
You. (Zarek)”
Source: Dance with the Devil

“We don’t laugh because we’re happy, we’re happy because we laugh.”
Variant: I don't sing because I'm happy. I'm happy because I sing.

“If you care about somebody, you should want them to be happy. Even if you wind up being left out.”
Source: The Perks of Being a Wallflower

Source: The Unabridged Journals of Sylvia Plath

“… the invincible power that has moved the world is unrequited, not happy love”
Variant: I became aware that the invincible power that has moved the world is unrequited, not happy, love.
Source: Memories of My Melancholy Whores
“You don't find happiness in the absence of problems. You find happiness in spite of problems.”
Source: Happiness Now!
Source: How to Kill a Rock Star

“Happiest are the people who give most happiness to others.”
As quoted in Happyology by Harald W. Tietze, p. 28

“Happiness lies within one's self, and the way to dig it out is cocaine.”
Source: Diary of a Drug Fiend

Attributed to John Stuart Mill in The Phrenological Journal and Science of Health, Vol. LXXXV (September 1887), p. 170
Disputed

Source: Your Best Life Now: 7 Steps to Living at Your Full Potential
“Decide what makes you happy and damn what anyone else thinks or says”
Source: Rush


“You can never get enough of what you don't need to make you happy.”
Variant: You can never get enough of what you don’t really need.

“It is a happy talent to know how to play.”
Source: For Darkness Shows the Stars

“The intention that man should be happy is not in the plan of Creation.”
Variant: One feels inclined to say that the intention that man should be "happy" is not included in the plan of "Creation."
Source: 1920s, Civilization and Its Discontents (1929), Ch. 2, as translated by James Strachey, p.53

“Everyone chases after happiness, not noticing that happiness is at their heels.”

Source: Your Best Life Now: 7 Steps to Living at Your Full Potential

“Parents were invented to make children happy by giving them something to ignore.”

Source: Horns

“The woman who survives intact and happy must be at once tender and tough.”

“The white man's happiness cannot be purchased by the black man's misery.”