“Everything I know, I learned from dogs.”

Troubles with Bird Dogs (1975)

As quoted in "Republican conference: Day two - Bush 'proud' of family" http://www.bbc.com/news/world-us-canada-32850481 (22 May 2015), by Anthony Zurcher, BBC News, United Kingdom: British Broadcasting Corporation
2010s

Letter to Emily Holmes Coleman (2 February 1934) http://www.case.edu/artsci/engl/VSALM/mod/brandelmcdaniel/index/library.htm

Hercule Poirot
Peril at End House (1932)
Context: I like to inquire into everything. Hercule Poirot is a good dog. The good dog follows the scent, and if, regrettably, there is no scent to follow, he noses around — seeking always something that is not very nice.

Source: The Angel Experiment

As quoted in "James Clavell, Best-Selling Storyteller of Far Eastern Epics, Is Dead at 69" by William Grimes in The New York Times (8 September 1994) http://query.nytimes.com/gst/fullpage.html?res=9D03E4D61138F93BA3575AC0A962958260&sec=&spon=&pagewanted=all
Context: Changi became my university instead of my prison. … Among the inmates there were experts in all walks of life — the high and the low roads. I studied and absorbed everything I could from physics to counterfeiting, but most of all I learned the art of surviving.

Donald Trump, Holding All The Cards The Tower! The Team! The Money! The Future!
Washington Post
1984-11-15
Lois
Romano
https://www.washingtonpost.com/pb/archive/lifestyle/1984/11/15/donald-trump-holding-all-the-cards-the-tower-the-team-the-money-the-future/8be79254-7793-4812-a153-f2b88e81fa54/?resType=accessibility, talking about his desire to be involved in negotiations with the then Soviet Union
1980s

Sé que anduve de lo antes breve a lo después eterno de todas las cosas, pero no sé cómo.
Voces (1943)