“It is the secret that a man and a woman keep from each other that makes them a couple”
Gantenbein (1964)
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Max Frisch 67
Swiss playwright and novelist 1911–1991Related quotes
“That’s the thing about spies. Most of the secrets we keep are from each other.”
Source: United We Spy

“What keeps a couple in harmony is to never lying to each other.”
Original: Ciò che mantiene una coppia in armonia è non mentirsi mai.
Source: prevale.net

During the Queen's Speech Debate, on the newly formed Coalition Government and their policy to provide a tax break to married couples http://www.publications.parliament.uk/pa/cm201011/cmhansrd/cm100525/debtext/100525-0002.htm#10052511000378, 25 May 2010.

“How can we expect others to keep our secrets if we cannot keep them ourselves?”
Comment prétendons-nous qu'un autre puisse garder notre secret, si nous ne pouvons le garder nous-mêmes?
Maxim 64 of the Maximes supprimées.
Later Additions to the Maxims

“Man and woman are two locked caskets, of which each contains the key to the other.”
"A Consolatory Tale"
Winter's Tales (1942)