„I didn't lie, I was writing fiction with my mouth."

Homer Simpson“

„Never inside, I didn't lie in my heart…“

—  Tennessee Williams, Un tranvía llamado Deseo

Fuente: A Streetcar Named Desire

„I didn't lie; nobody calls me a liar, I may have increased my age.“

—  Frank Buckles United States Army soldier and centenarian 1901 - 2011

Joking on joining the Army at age 15.
CNN March 8, 2008.

„It’s not a lie. It’s a gift for fiction.“

—  David Mamet American playwright, essayist, screenwriter, and film director 1947

„Fiction is the truth inside the lie.“

—  Stephen King American author 1947

„If you want to write fiction, the best thing you can do is take two aspirins, lie down in a dark room, and wait for the feeling to pass.“

—  Lawrence Block American writer 1938

Fuente: Writing the Novel: From Plot to Print

„I want to write, but more than that, I want to bring out all kinds of things that lie buried deep in my heart.“

—  Anne Frank victim of the Holocaust and author of a diary 1929 - 1945

„My lips told a lie
For a trivial reason
It wasn't for anyone else
But only to protect myself
And I didn't think about anyone else“

—  Ayumi Hamasaki Japanese recording artist, lyricist, model, and actress 1978

Walking Proud
Lyrics, My Story

„Fiction is the lie through which we tell the truth.“

—  Albert Camus French author and journalist 1913 - 1960

Pablo Picasso said something very similar. Perhaps it is the source? From Herschel B. Chipp’s Theories of Modern Art: "We all know that Art is not truth. Art is a lie that makes us realize truth, at least the truth that is given us to understand."
Disputed

„Fiction is the lie that tells the truth, after all.“

—  Neil Gaiman English fantasy writer 1960

Why our future depends on libraries, reading and daydreaming (2013)
Contexto: We writers – and especially writers for children, but all writers – have an obligation to our readers: it's the obligation to write true things, especially important when we are creating tales of people who do not exist in places that never were – to understand that truth is not in what happens but what it tells us about who we are. Fiction is the lie that tells the truth, after all.

„Kids, the fiction is the truth inside the lie, and the truth of this fiction is simple enough: the magic exists.“

—  Stephen King, libro Eso

It (1986)

„Everything is a lie in this world
Really everything is a lie
Everything is a lie, I tell my self
Everything is a lie, why is it?“

—  Manu Chao French Spanish singer, guitarist and record producer 1961

Todo es mentira en este mundo
Todo es mentira la verdad
Todo es mentira yo me digo
Todo es mentira ¿Por qué será?
Mentira https://www.youtube.com/watch_popup?v=PCZuYK3Rjig.
Clandestino (1998)

„When I sit down to write a book, I do not say to myself, 'I am going to produce a work of art.' I write it because there is some lie that I want to expose, some fact to which I want to draw attention, and my initial concern is to get a hearing.“

—  George Orwell, Why I Write

Fuente: Why I Write

„It's my lie and I believe in it
It's my lie and I wanted it
It's my bed and I'll bleed in it
It's my bed, and I'll lie
And I sit on the corner
And I drink drown soda
I wanna bomb the whole state of Minnesota“

—  Courtney Love American punk singer-songwriter, musician, actress, and artist 1964

"Drown Soda"
Song lyrics, B-sides and compilations

„You may lie with your mouth, but with the mouth you make as you do so you none the less tell the truth.“

—  Friedrich Nietzsche German philosopher, poet, composer, cultural critic, and classical philologist 1844 - 1900

„State is the name of the coldest of all cold monsters. Coldly it lies; and this lie slips from its mouth: 'I, the state, am the people’.“

—  Friedrich Nietzsche, libro Así habló Zaratustra

Thus Spoke Zarathustra; A Book for All and None, trans. Kaufmann, New York: NY, Modern Library (1995) p. 48, 1.11: “On the New Idol”

„I knew that I couldn't lie beside her, without wanting to touch her. I couldn't have felt her breath come upon my mouth, without wanting to kiss her. And I couldn't have kissed her, without wanting to save her.“

—  Sarah Waters novelist 1966

„I cannot tell a lie, I did it with my little hatchet.“

—  George Washington first President of the United States 1732 - 1799

The earliest source of this quote was a famous anecdote in The Life of George Washington, with Curious Anecdotes Laudable to Himself and Exemplary to his Countrymen (1806) by Parson Weems, which is not considered a credible source, and many incidents recounted in the work are now considered to have sprung entirely from Weems’ imagination. This derives from an anecdote of Washington, as a young boy, confessing to his father Augustine Washington that it was he who had cut a cherished cherry tree.
Variant:Father, I cannot tell a lie, I cut the tree.
Misattributed, Spurious attributions

„In my show I announce, ‘People say Lady Gaga is a lie, and they are right. I am a lie. And every day I kill to make it true.“

—  Lady Gaga American singer, songwriter, and actress 1986

Lady Gaga: How the world went crazy for the new queen of pop http://www.independent.co.uk/arts-entertainment/music/features/lady-gaga-how-the-world-went-crazy-for-the-new-queen-of-pop-1684375.html

„I cannot tell a lie, I did it with my little hatchet.“

—  Mason Weems fictionalizing biographer of George Washington 1759 - 1825

Portrayed as the words of the young George Washington, confessing to have damaged a cherry tree in Life of Washington (1800)