The Complete Neurotic's Notebook (1981), Unclassified
“This is a great country and requires a good deal of all of us, so I can imagine nothing more important than for all of you to continue to work in public affairs and be interested in them, not only to bring up a family, but also give part of your time to your community, your state, and your country.”
"Remarks to the Delegates of Girls Nation (322)" (2 August 1963) http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations.aspx
1963
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John F. Kennedy 469
35th president of the United States of America 1917–1963Related quotes

"Remarks to Student Participants in the White House Seminar in Government (334)" (27 August 1963) http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations.aspx
1963

2010s, 2015, Remarks at the SMU 100th Spring Commencement (May 2015)
Seeing is important. Smelling is important. Hearing is important. Everything is important and you have to look at, study, get involved with everything, and you have to believe what you find out, and test, and finally prove! None of this nonsense about not believing in fossils because God was just playing around in order to confuse us. If you ignore the evidence of your (dare one say God-given) senses, if you define myth as reality, and if you claim divine revelation allows you to destroy any part of creation, you have committed absolute evil.
Do we have any way of knowing exactly what is intended for the universe to be or become? No, but given the age and complexity of the whole shebang, we can be fairly sure creation is important.
Strange Horizons interview (2008)

2014, Address to European Youth (March 2014)

Advice to a Confederate widow who expressed animosity towards the northern U.S. after the end of the American Civil War, as quoted in The Life and Campaigns of General Lee https://archive.org/stream/lifeandcampaign00chilgoog/lifeandcampaign00chilgoog_djvu.txt (1875) by Edward Lee Childe, p. 331. Also quoted in "Will Confederate Heritage Advocates Take Robert E. Lee’s Advice?" https://web.archive.org/web/20140918064605/http://cwcrossroads.wordpress.com/2014/07/17/will-confederate-heritage-advocates-take-robert-e-lees-advice/ (July 2014), by Brooks D. Simpson, Crossroads, WordPress. This quote is sometimes paraphrased as: "Madam, do not train up your children in hostility to the government of the United States. Remember, we are all one country now. Dismiss from your mind all sectional feeling, and bring them up to be Americans."

Address to the people of the Bhutan on the coronation day, 2 June 1974, quoted in The Talking Mountains (26 Oct 2015)

Section VIII: “Monopoly, Or Opportunity?”, p. 186 http://books.google.com/books?id=MW8SAAAAIAAJ&pg=PA186&dq=%22Let+me+say+again%22
1910s, The New Freedom (1913)