“I can assure you that there is no career which you will adopt when you leave college that will bring you a more and greater sense of satisfaction and a greater feeling of participation in a great effort than will your work here or in your state or in your community…this generation of Americans — you here who will be in positions of responsibility for the rest of this century — will deal with the most difficult, sensitive, and dangerous problems that any society of people has ever dealt with at any age…The Greeks defined happiness as the full use of your powers along the lines of excellence, and I can imagine no place where you can use your powers more fully along lines more excellent in the 1960's than to be in the service of the United States.”

1963, Address at Vanderbilt University

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

"Remarks to the Delegates of Girls Nation (322)" (2 August 1963) http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations.aspx
1963

Letter to high school student Barbara Lee Wilson (7 January 1943), Einstein Archives 42-606
1940s

Oui, je le répète : c'est la société qui fait les criminels, et vous jurés, au lieu de les frapper, vous devriez employer votre intelligence et vos forces à transformer la société. Du coup, vous supprimeriez tous les crimes ; et votre œuvre, en s'attaquant aux causes, serait plus grande et plus féconde que n'est votre justice qui s'amoindrit à punir les effets.
Trial statement

"We Are a Powder Drink" (20 August 2008) http://www.youtube.com/watch?v=My7jqQx0mfo

New Year's Address to the Nation (1991)

Source: The 48 Laws of Power