“I mean what I say and I try to say what I mean.”

The Love Song of J. Alfred Prufrock (1915)
Source: The Love Song of J. Alfred Prufrock and Other Poems
Context: It is impossible to say just what I mean!
But as if a magic lantern threw the nerves in patterns on a screen:
Would it have been worth while If one, settling a
Pillow or throwing off a shawl,
And turning toward the window, should say:
"That is not it at all,
That is not what I meant, at all."

Source: The BFG

[Gumball 3000- Jackass Episodes]

In John Sloan on Drawing and Painting. Mineola NY: Dover Publications, 2000. Originally published in 1939 as The Gist of Art, p. 7.
The Gist of Art (1939)

Introduction for his unfinished novel, Whistle (1978) the third part of his war trilogy (which was completed by Willie Morris); quoted in TIME magazine (13 March 1978) http://www.time.com/time/magazine/article/0,9171,919437,00.html

As quoted in Lincoln; An Account of his Personal Life, Especially of its Springs of Action as Revealed and Deepened by the Ordeal of War (1922) by Nathaniel Wright Stephenson.
1860s

§ 504
Philosophical Investigations (1953)

Source: Always True (Moody, 2011), p. 47