We nominated Jeremy Corbyn for the leadership. Now we regret it (6 May 2016)
“We cannot sit back and hope that everything works out for the best. We cannot afford to be tired or frustrated or cynical.”
2010s, 2016 Democratic National Convention (2016)
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Michelle Obama 108
lawyer, writer, wife of Barack Obama and former First Lady … 1964Related quotes

2000s, A Challenge to Overcome (November 2007)

Speaking & Features, My African Dream: Faith Rally Address, COP17

“Most rats read. Our frustration is, we cannot hold a pen to write.”

Barack Obama: "The President's News Conference With Prime Minister Gordon Brown of the Untied Kingdom in London, England," April 1, 2009. Online by Gerhard Peters and John T. Woolley, The American Presidency Project. http://www.presidency.ucsb.edu/ws/index.php?pid=85953&st=&st1=
2009

“We cannot all do everything.”
Non omnia possumus omnes.
Book VIII, line 63 (tr. Fairclough)
Eclogues (37 BC)

Speech at Zurich University (September 19, 1946) ( partial text http://www.churchill-society-london.org.uk/astonish.html) ( http://www.peshawar.ch/varia/winston.htm).
Post-war years (1945–1955)

Source: I Have a Dream: Writings and Speeches That Changed the World