“The same principle that forbids me to lie does not allow me to tell the truth.”
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Giacomo Casanova 55
Italian adventurer and author from the Republic of Venice 1725–1798Related quotes

Variant: A sign is anything that can be used to tell a lie.
Source: Trattato di semiotica generale (1975); [A Theory of Semiotics] (1976)

as quoted by Paul Krassner in Lenny Bruce: Swear to tell the truth 1998 http://www.imdb.com/title/tt0175844/

Source: The Dream of a Ridiculous Man (1877), II
Context: Yes, I dreamed a dream, my dream of the third of November. They tease me now, telling me it was only a dream. But does it matter whether it was a dream or reality, if the dream made known to me the truth? If once one has recognized the truth and seen it, you know that it is the truth and that there is no other and there cannot be, whether you are asleep or awake. Let it be a dream, so be it, but that real life of which you make so much I had meant to extinguish by suicide, and my dream, my dream — oh, it revealed to me a different life, renewed, grand and full of power!

“2084. He that does not speak Truth to me, does not believe me when I speak Truth.”
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)

“And why does this same God tell me how to raise my children when he had to drown his?”
Source: Some Mistakes of Moses (1879) http://www.positiveatheism.org/hist/ingermm2.htm#XVIII] Section XVIII, "Dampness".
Source: Out of Sight, Out of Time