“American traditions and the American ethic require us to be truthful, but the most important reason is that truth is the best propaganda and lies are the worst. To be persuasive we must be believable; to be believable we must be credible; to be credible we must be truthful. It is as simple as that.”

Remarks at Amherst College (26 October 1963)
1963

Requiem for a Dream (1978)

2010s, 2016, July, (21 July 2016)

Source: Reasons and Persons (1984), p. 619

A Language Older Than Words (2000)

Source: Middlesex

Source: Success! (1977), p. 284; a portion of this — "In order to succeed we must first believe that we can" — has become widely attributed to Nikos Kazantzakis on the internet, but without citation of any sources.
Context: The American system demands success, and in order to succeed we must first believe that we can. Yet our society, with its intolerance of failure and poverty, traps millions of people in positions where any kind of success seems impossible to contemplate, and in which failure itself is a kind of passive rebellion against their own misery and the social system which created it in the first place.
To succeed it is necessary to accept the world as it is and rise above it.

The Review and Herald (27 March 1890); also in Counsels for Writers and Editors http://books.google.de/books?id=UEM4uBD04asC&printsec=frontcover&dq=Counsels+to+writers+and+editors&cd=1#v=onepage&q&f=false (1946), p. 33; also in Evangelism http://books.google.de/books?id=gsy20ga71LEC&printsec=frontcover&dq=Ellen+Gould+Harmon+White+Evangelism&cd=1#v=onepage&q&f=false (1946), p. 296; also in 1888 - The Ellen G. White 1888 Materials (1987), Ch. 64, p. 547.

Political questionnaire response (1952)