“Guard yourself against accusations, even if they are false; for the multitude are ignorant of the truth and look only to reputation.”
Verse 17.
To Demonicus
Context: Guard yourself against accusations, even if they are false; for the multitude are ignorant of the truth and look only to reputation. In all things resolve to act as though the whole world would see what you do; for even if you conceal your deeds for the moment, later you will be found out. But most of all will you have the respect of men, if you are seen to avoid doing things which you would blame others for doing.
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Isocrates 23
ancient greek rhetorician -436–-338 BCRelated quotes

It is a law to rob us of our civil rights and job rights. It is supported by Southern segregationists who are trying to keep us from achieving our civil rights and our right of equal job opportunity. Its purpose is to destroy labor unions and the freedom of collective bargaining by which unions have improved wages and working conditions of everyone…Wherever these laws have been passed, wages are lower, job opportunities are fewer and there are no civil rights. We do not intend to let them do this to us. We demand this fraud be stopped. Our weapon is our vote.
Speaking on right-to-work laws in 1961, as quoted in Now Is the Time. Dr. Martin Luther King Jr. on Labor in the South: The Case for a Coalition (January 1986)
1960s
Knowing Yourself: The True in the False (1996)

Source: The New Moon's Arms (2007), Chapter 2 (p. 72)
“Pain will force even the truthful to speak falsely.”
Maxim 232
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave
The Chronicle of Henry of Huntingdon (trans. Thomas Forester), Book VI
Godwin supposedly said this just before he choked to death on a piece of bread at the table of King Edward "the Confessor", but the story is very doubtful.
Misattributed

Lu Xun studied medicine before he became a writer. Once he saw on a film a Chinese being executed by Japanese while many other Chinese were watching this "spectacular event". This made him feel that saving the "souls" of people is more important than saving their bodies.
Source: From the preface of his work Na Han (Call to Arms) (1922)

“Guard your honor. Let your reputation fall where it will. And outlive the bastards.”
Source: Vorkosigan Saga, A Civil Campaign (1999)
“The search for necessary truths, truths that are not only true, but they couldn’t have been false.”
In the Veery journal interview in 1996, in reply to the question of "What is the most rewarding aspect of philosophy?" presented by Veery editor Steven Vita, later reprinted in 1997 in the Austin American-Statesman and then quoted from in The New York Times obituary entitled “Charles Hartshorne, Theologian, Is Dead; Proponent of an Activist God Was 103.”