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Marcus Tullius Cicero 180
Roman philosopher and statesman -106–-43 BCRelated quotes

“The happiness of men consists in life. And life is in labor.”
What Is To Be Done? (1886) Chap. XXXVIII, as translated in The Novels and Other Works of Lyof N. Tolstoï (1902) edited by Nathan Haskell Dole, p. 259

“A happy life consists not in the absence, but in the mastery of hardships.”
The Simplest Way to be Happy (1933)

Quoted in A Dictionary of Quotations, in Most Frequent Use by D.E. Macdonnel (1809) translated from French: Le bonheur de l'homme en cette vi ne consiste pas á être sans passions: il consiste à en être le maître.
Misattributed

“Allah is the only source of happiness, joy, peace and tranquility.”
"Don’t Look Far For The Reason For Unhappiness: The Cause Is Hearts Turning Aside From Allah" in BLITZ (18 January 2015) http://www.weeklyblitz.net/2015/01/dont-look-far-reason-unhappiness-cause-hearts-turning-aside-allah/.
Context: Allah is the only source of happiness, joy, peace and tranquility. We can only be happy and at peace if Allah so desires. Yet if Allah so desires we can also delight in good things. But it is impossible for us to attain that by any other means than faith in Allah.

"Wordsworth in the Tropics" in Do What You Will (1929)
Source: Do What You Will: Twelve Essays
Context: Too much consistency is as bad for the mind as it is for the body. Consistency is contrary to nature, contrary to life. The only completely consistent people are the dead. Consistent intellectualism and spirituality may be socially valuable, up to a point; but they make, gradually, for individual death.
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 589.

“I don't believe that happiness is possible, but I think tranquility is.”

Source: "Intuitions" (October 1932), published in Youthful Writings (1976)

“By a tranquil mind I mean nothing else than a mind well ordered.”
IV, 3
Meditations (c. 121–180 AD), Book IV