“The dread of futility has been my life-long plague.”

Source: Night Pleasures

This quote was actually crafted by University College Dublin student Shane Fitzgerald. Shortly after Jarre's death, Fitzgerald uploaded https://en.wikipedia.org/w/index.php?title=Maurice_Jarre&type=revision&diff=280558491&oldid=280527998 the false quote to Wikipedia to test "how our globalised, increasingly internet-dependent media was upholding accuracy and accountability in an age of instant news," according to the Associated Press. "The sociology major's made-up quote…flew straight on to dozens of US blogs and newspaper websites in Britain, Australia and India. They used the fabricated material, Fitzgerald said, even though administrators at the free online encyclopedia quickly caught the quote's lack of attribution and removed it, but not quickly enough to keep some journalists from cutting and pasting it first. A full month went by and nobody noticed the editorial fraud. So Fitzgerald told several media outlets in an email and the corrections began." The Guardian and The Herald "are among the only publications to make a public mea culpa," the Associated Press continues. See " Student hoaxes world's media with fake Wiki quote http://www.smh.com.au/news/technology/web/student-hoaxes-worlds-media-with-fake-wiki-quote/2009/05/12/1241893953955.html," The Sydney Morning Herald (12 May 2009).
Misattributed

Psyche
Till We Have Faces: A Myth Retold (1956)
Context: The sweetest thing in all my life has been the longing — to reach the Mountain, to find the place where all the beauty came from — my country, the place where I ought to have been born. Do you think it all meant nothing, all the longing? The longing for home? For indeed it now feels not like going, but like going back.

Source: The Book of Disquiet

Letter from Agamemnon at sea (10 March 1795), in Nelson's letters to his wife and other documents, 1785-1831 edited by Navy Records Society, p. 199
1790s
Context: The lives of all are in the hands of Him who knows best whether to preserve it or no, and to His will do I resign myself. My character and good name are in my own keeping. Life with disgrace is dreadful. A glorious death is to be envied, and, if anything happens to me recollect death is a debt we must all pay, and whether now or in a few years hence can be but of little consequence.

The Soul of a Butterfly, 2004
Variant: All through my life I have been tested. My will has been tested, my courage has been tested, my strength has been tested. Now my patience and endurance are being tested.
Source: The Soul of a Butterfly: Reflections on Life's Journey

Source: Prozac Nation

as quoted by de:Wolf-Dieter Dube, in Expressionism, de:Wolf-Dieter Dube; Praeger Publishers, New York, 1973, p. 89