“No it is not easy to write. It is as hard as breaking rocks. Sparks and splinters fly like shattered steel.”
Source: The Hour of the Star
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Clarice Lispector 34
Brazilian writer 1920–1977Related quotes

“Promises were like bad checks, easy to write and hard to cash.”
Source: Blind Lake (2003), Chapter 15 (p. 179)

“Easy reading is damn hard writing.”
Also attributed to Ernest Hemingway and others; the earliest definite occurrence of this yet found in research for Wikiquote is by Maya Angelou, who stated it in Conversations With Maya Angelou (1989) edited by Jeffrey M. Elliot:
I think it's Alexander Pope who says, "Easy writing is damn hard reading," and vice versa, easy reading is damn hard writing
The statement she referred to is most probably:
You write with ease, to show your breeding,
But easy writing's curst hard reading
Clio's Protest, or the Picture Varnished (written 1771, published 1819) by Richard Brinsley Sheridan
Disputed

“Writing is easy. It's just the typing that's hard.”
Miles Sparks, Prologue, p. 3
2000s, Three Weeks with My Brother (2004)

“Easy writing makes hard reading.”
As quoted in Paris Was Our Mistress (1947) by Samuel Putnam, p. 128

“You write with ease to show your breeding,
But easy writing's curst hard reading.”
Clio's Protest (1819).

Letter to A.S. Suvorin (May 4, 1889)
Letters

“…nothing else left but
to watch eternity
breaking up
into human splinters.”
Poems, Shadow of Time (2005)

2000s, 2001, A Great People Has Been Moved to Defend a Great Nation (September 2001)