“Happiness and suffering are states of mind and so their main causes are not to be found outside the mind.”
Modern Buddhism: The Path of Compassion and Wisdom (2011)
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Kelsang Gyatso 10
Tibetan writer and lama 1931Related quotes

“A sound mind in a sound body, is a short but full description of a happy state in this world.”
Sec. 1
Some Thoughts Concerning Education (1693)

Lithium.
Song lyrics, Nevermind (1991)
Variant: I'm so happy
'Cause today I found my friends
They're in my head.
I'm so ugly, that's okay
'Cause so are you,
Broke our mirrors.
Source: Nirvana

“Being happy, a state of mind of inner well-being that terribly disturbs those who are not.”
Original: (it) L'esser felice, uno stato d'animo di benessere interiore che disturba terribilmente chi non lo è.
Source: prevale.net
In the Belly of the Beast (1981)

“I'm so happy. Cause today I found my friends.
They're in my head.”
Source: Artwork.

“Deception is a state of mind and the mind of the State.”
Deception: The Invisible War Between the KGB and the CIA http://www.encyclopedia.com/doc/1G1-7775367.html
Operation Gladio http://www.informationliberation.com/?id=16921