“Justice is a temporary thing that must at last come to an end; but the conscience is eternal and will never die.”
On Marriage (1530)
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Martin Luther 214
seminal figure in Protestant Reformation 1483–1546Related quotes

1960s, How Long, Not Long (1965)
Context: I must admit to you that there are still jail cells waiting for us, and dark and difficult moments. But if we will go on with the faith that nonviolence and its power can transform dark yesterdays into bright tomorrows, we will be able to change all of these conditions. And so I plead with you this afternoon as we go ahead: remain committed to nonviolence. Our aim must never be to defeat or humiliate the white man, but to win his friendship and understanding. We must come to see that the end we seek is a society at peace with itself, a society that can live with its conscience. And that will be a day not of the white man, not of the black man. That will be the day of man as man.

“Conscience is a mother-in-law whose visit never ends.”
1940s–present, A Mencken Chrestomathy (1949)

Letter to three students (October 1967) as translated in Solzhenitsyn: A Documentary Record (1970) edited by Leopold Labedz (1970) “The Struggle Intensifies".

“To accomplish great things we must live as though we had never to die.”
Pour exécuter de grandes choses, il faut vivre comme si on ne devait jamais mourir.
Quoted in Queers in History: The Comprehensive Encyclopedia of Historical Gays (2009), by Keith Stern, p. 466.
Variant: In order to achieve great things, we must live as though we were never going to die.
Source: Reflections and Maxims (1746), p. 172.