In a postcard sent to Wayne Westerberg, April 27, 1992.
Source: Mary Ellen Barnes (ed.). Back to the Wild (2nd ed.). Twin Star Press, 2013. ISBN 978-0-9833955-0-8. (pp. 172-173)
Quotes about sender
A collection of quotes on the topic of sender, time, timing, receiver.
Quotes about sender

As quoted in "Farrakhan in Speech: 'My Time Is Up' " by Jeff Karoub http://abcnews.go.com/US/wireStory?id=2903211 ABC News (26 February 2007)
Calvin Mooers (1950). " Information retrieval viewed as temporal signaling http://www.mathunion.org/ICM/ICM1950.1/Main/icm1950.1.0565.0576.ocr.pdf#page=8". Proceedings of the International Congress of Mathematicians. Vol. 1, S.572-573

Counterterrorism and Cybersecurity: Total Information Awareness (2nd Edition), 2015
Source: Organizational stress: Studies in role conflict and ambiguity, 1964, p. 20

Mikael Rothstein, "Scientology, scripture, and sacred tradition" in – [Lewis, James R. Lewis, w:James R. Lewis, Olav Hammer, The Invention of Sacred Tradition, Cambridge University Press, 2007, 0521864798, 36].
About
Source: Organizational stress: Studies in role conflict and ambiguity, 1964, p. 67
The activity of telling oneself and the world "I am still alive."
On Kawara, "1970 Telegram," as cited in: " On Kawara Today http://greg.org/archive/2014/07/10/on_kawara_today.html," By greg on July 10, 2014 8:27 PM.

“No one cares to speak to an unwilling listener. An arrow never lodges in a stone: often it recoils upon the sender of it.”
Nemo invito auditori libenter refert. Sagitta in lapidem nunquam figitur, interdum resiliens percutit dirigentem.
Letter 52
Letters