Maharishi Mahesh Yogi, in CNN Larry King Weekend:Interview With Maharishi Mahesh Yogi http://transcripts.cnn.com/TRANSCRIPTS/0205/12/lklw.00.html, (2002)
Quotes about happiness
page 52
Pg 16
The Menace of the Herd (1943)

The Romance of Commerce (1918), Concerning Commerce
As quoted in [Man, Chella, What It’s Like to Be Trans and Live With Gender Dysphoria, https://www.teenvogue.com/story/what-its-like-to-be-trans-and-live-with-gender-dysphoria, 29 January 2019, Teen Vogue, September 21, 2018]

Inaugural address (1837)

1990s, On My Country and the World (1999)

Address on the opening of the Eton Library (1833) as quoted in A History of Inventions, Discoveries and Origins (1846) by John Beckmann, Tr. William Johnston, Vol. 1, frontispiece. https://archive.org/details/historyofinventi01unse/page/n5/mode/2up

Source: Young Adventure (1918), The Quality of Courage

Source: Speech in Edinburgh (30 October 1867), quoted in The Chancellor of the Exchequer in Scotland; Being Two Speeches Delivered by Him in the City of Edinburgh on 29th and 30th October, 1867 (1867), pp. 36-37

“Contentment is...the root of all happiness.”
The Hindu Way ( Page 70 )

https://www.clickittefaq.com/freedom-fighters-are-heroes-not-cricketers-mashrafe/
LiNK’s Hannah Song: Forever Committed to a Cause https://web.archive.org/web/20160414025408/ttp://www.mochimag.com/article/links-hannah-song-forever-committed-to-a-cause (2010)
School is out (1876); reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Original: (it) Fa che ogni tuo istante sia sempre migliore di quello passato, si vive di presente per il futuro, si vive d'amore, musica, felicità e soprattutto coraggio nei momenti difficili.
Source: prevale.net

Original: (it) Non cancello nessun giorno della mia vita, i giorni belli mi hanno regalato felicità, quelli brutti mi hanno dato esperienza... i peggiori, mi hanno insegnato a non mollare mai.
Source: prevale.net

Source: The New Ethics (1907), The Perils of Over-population, pp. 157–158

Jeff Danna Interview https://www.ign.com/articles/2004/08/28/jeff-danna-interview (27 August 2004)

“A large income is the best recipe for happiness I ever heard of.”
Mansfield Park (1814)
Works, Mansfield Park

“I was quite happy standing there thundering about, playing whatever I could - that's "fun.”
And I see young bands occasionally now doing the same thing. I think it's called "thrash" now. It's the same thing: It's just kids who can't play, pissing about. It's terrific. That's all we were doing. I mean, Dave could play a little bit, but none of the rest of us could."
Musician, December 1992
Music
You can't go out and get it like a cup of tea. It's the way you feel about things."
Source: Fire and Hemlock (1985), p. 311.

Speech http://hansard.millbanksystems.com/commons/1877/may/07/postponement-of-orders-of-the-day#column_437 in the House of Commons (7 May 1877)
1870s

“Be happy thinking about what you have that money cannot buy. Life is also made of this.”
From the Quotes http://www.prevale.net/quotes.html page of the official website of Prevale
Original: (it) Sii felice pensando a ciò che hai che i soldi non possano comprare. La vita è fatta anche di questo.
Source: prevale.net

Source: Man for Himself (1947), p.189

‘Introduction’, New Fabian Essays (1952), p. 29

Source: Man to Man: Rediscovering Masculinity in a Challenging World (2020), p. 119

“Happiness is when what you think, what you say, and what you do are in harmony.”

“Happiness comes when your work and words are of benefit to yourself and others.”

“Happiness is not something ready made. It comes from your own actions.”

“All I required to be happy was friendship and people I could admire.”
“All of our technology is completely unnecessary to a happy life.”

“Happiness mainly comes from our own attitude, rather than from external factors.”
Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe, (1998), Quotations from "Journey to Ixtlan" (Chapter 8)

“The truest greatness lies in being kind, the truest wisdom in a happy mind.”

“Love is the master key that opens the gates of happiness.”

“The greatest part of our happiness depends on our dispositions, not our circumstances.”

“Happiness often sneaks in through a door you didn't know you left open.”

“The amount of happiness that you have depends on the amount of freedom you have in your heart.”

“Happiness resides not in possessions, and not in gold, happiness dwells in the soul.”

“People don't notice whether it's winter or summer when they're happy.”

“Every gift from a friend is a wish for your happiness.”

“The most important thing is to enjoy your life – to be happy – it’s all that matters.”
“I've always been a happy priest; I plan on being a happy bishop.”
Bishop Mark O'Connell: 'I plan on being a happy bishop https://thebostonpilot.com/article.asp?ID=177277 (2016)

“The wise man is joyful, happy and calm, unshaken, he lives on a plane with the gods.”
Epistulae Morales ad Lucilium (Moral Letters to Lucilius), Letter LIX: On Pleasure and Joy

“Of music and happiness, always make your lifestyle.”
Original: (it) Di musica e felicità, fanne sempre il tuo stile di vita.
Source: prevale.net

“Live so that happiness is your priority.”
Original: (it) Vivi in modo che la felicità sia la tua priorità.
Source: prevale.net

“Love fascinates when your happiness becomes its necessity.”
Original: (it) L'amore affascina quando la tua felicità diventa la sua necessità.
Source: prevale.net

Original: (it) Sotto le coperte, prima di addormentarmi divento sempre curioso e felice perché so di poterti sognare.
Source: prevale.net

“The woman is a divinity. First of all: her happiness.”
Original: (it) La donna è una divinità. Prima di tutto: la sua felicità.
Source: prevale.net

Quoting Jean-Jacques Rousseau
Misc Quotes

Excerpts from inaugural address (February 25, 2013)
Youngest bishop in the U.S. ready to “propose the mystery” of the Church to Detroit https://www.catholicnewsagency.com/news/8177/youngest-bishop-in-the-us-ready-to-propose-the-mystery-of-the-church-to-detroit (November 29, 2006)

"Wong Kar-wai by Han Ong" in Bomb Magazine (1 Janaury 1998) https://bombmagazine.org/articles/wong-kar-wai-1/
“When you willingly give up your own happiness for someone else, that is the sign of true love.”

The visit of King Albert I to the Belgian Congo in 1928. Between propaganda and reality. https://www.congoforum.be/Upldocs/Het_bezoek_van_koning_Albert_I_aan_Belgi.compressed.pdf

Aurangzeb, just before his death, as quoted from Niccolao Manucci, Storia do Mogor; or, Mogul India 1653-1708 https://archive.org/details/storiadomogororm04manu/page/398/mode/2up, Vol. 4, p. 398.

“The surest way to be unhappy is try to be happy all the time.”
Source: Master of Space and Time (1984), Chapter 23, “The Way Uptown” (p. 180)
“Everyone was polite; no one was happy.”
Source: The Heritage Universe, Summertide (1990), Chapter 11, “Summertide Minus Thirteen” (p. 126)

“When men feel happy, they think of men who love; when they feel sad they think and pray to God.”
Gli uomini quando si sentono felici pensano agli uomini che amano, quando si sentono tristi pensano e pregano Dio.

“Giving is doing exactly the same work as God, thus making Him happy in return.”

“You are not happy because of your location, but because of your mindset.”

As quoted in "‘Tigertail’s Tzi Ma Transcends Role As Hollywood’s Go-To Asian Father To Become Trailblazing Icon" in Deadline (8 April 2020) https://deadline.com/2020/04/tzi-ma-tigertail-asian-american-hollywood-diversity-inclusion-representation-1202900973/

All the righteous, all the saints, all the holy martyrs were happy.
Book II, ch. 4 (trans. Constance Garnett)
General, The Brothers Karamazov (1879–1880)