“Here is the chalk." This is a truth; and here and the now hereby characterize the chalk so that we emphasize by saying; the chalk, which means "this." We take a scrap of paper and we write the truth down: "Here is the chalk.”
We lay this written statement beside the thing of which it is the truth. After the lecture is finished both doors are opened, the classroom is aired, there will be a draft, and the scrap of paper, let us suppose, will flutter out into the corridor. A student finds it on his way to the cafeteria, reads the sentence. "Here is the chalk," and ascertains that this is not true at all. Through the draft the truth has become an untruth. Strange that a truth should depend on a gust of wind. ... We have made the truth about the chalk independent of us and entrusted it to a scrap of paper. p. 29-30
What Is A Thing? (1935, 1968)
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Martin Heidegger 69
German philosopher 1889–1976Related quotes

Source: Diverse new Sorts of Soylenot yet brought into any publique Use, 1594, p. 23-24; Cited in: Malcolm Thick (1994)

“The fascination of what’s difficult,” said Chalk. “It spins the world on its bearings.”
Source: Thorns (1967), Chapter 1, “The Song the Neurons Sang” (p. 7)

"Whatever You Say, Say Nothing", line 57, from North (1975).
Other Quotes
“There is no past or future. Using tenses to divide time is like making chalk marks on water.”

1860s, On a Piece of Chalk (1868)

"Future widows of America: Write your congressman" in Jewish World Review (28 September 2001) http://www.jewishworldreview.com/cols/coulter092801.asp.
2001

1860s, On a Piece of Chalk (1868)

“On a detox loft through a Glendale Park over sidewalk chalk
Someone wrote in red, "start over."”
Cleanse Song
Cassadaga (2007)
Source: How the Irish Saved Civilization (1995), Ch. VI What Was Found