“The chains of wedlock are so heavy that it takes two to carry them; sometimes three.”
Les chaînes du mariage sont si lourdes qu'il faut être deux pour les porter; quelquefois trois.
Attributed to Dumas in: Elizabeth Abbott, Une histoire des maîtresses http://books.google.gr/books?id=fEsPUICzDY4C&dq=, Les Éditions Fides, 2004, p. 16.
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Les chaînes du mariage sont si lourdes qu'il faut être deux pour les porter; quelquefois trois.
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Alexandre Dumas 123
French writer and dramatist, father of the homonym writer a… 1802–1870Related quotes

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Manifesto Of Letterist Poetry, 1942

“Chains of habit are too light to be felt until they are too heavy to be broken.”
Though Buffet is reported to have expressed such ideas with such remarks many times in his lectures, he never claimed to originate the idea, and in the article "The Chains of Habit Are Too Light To Be Felt Until They Are Too Heavy To Be Broken" at the Quote Investigator http://quoteinvestigator.com/tag/warren-buffett/ it is shown that this sort of expression about chains goes back at least to similar ideas presented by Samuel Johnson in "The Vision of Theodore, The Hermit of Teneriffe, Found in His Cell" in The Gentleman’s Magazine, Vol. 18 (April 1748), p.160:
It was the peculiar artifice of Habit not to suffer her power to be felt at first. Those whom she led, she had the address of appearing only to attend, but was continually doubling her chains upon her companions; which were so slender in themselves, and so silently fastened, that while the attention was engaged by other objects, they were not easily perceived. Each link grew tighter as it had been longer worn, and when, by continual additions, they became so heavy as to be felt, they were very frequently too strong to be broken.
Such sentiments were later succinctly summarized by Maria Edgeworth in Moral Tales For Young People by Miss Edgeworth (1806), Vol 1, Second Edition, p. 86:
… the diminutive chains of habit, as somebody says, are scarcely ever heavy enough to be felt, till they are too strong to be broken.
Disputed

“Time is heavy sometimes; imagine how heavy eternity must be.”
The Book of Delusions (1936)
“There are three iron links in the neurotic's chain: unloving, unlovable, unloved.”
The Complete Neurotic's Notebook (1981), Neurotics and neurosis