“I think that to safeguard the earth and maintain its great heritage it is important to exalt human responsibility, because the only being responsible for the other beings is man. Nothing less can come about from his humanity and his responsibility.”

In the House of Commons, February 28, 1906 speech South African native races http://hansard.millbanksystems.com/commons/1906/feb/28/south-african-native-races#S4V0152P0_19060228_HOC_307
Early career years (1898–1929)

Source: Discovery of Freedom: Man's Struggle Against Authority (1943), p. xii.

Fyodor Dostoevsky in The Brothers Karamazov; this was used as an epigraph in The Blood of Others, and is sometimes attributed to de Beauvoir
Misattributed

The reference to Cassius is that of the character in William Shakespeare's play Julius Caesar. Listen to an mp3 sound file http://www.otr.com/murrow_mccarthy.shtml of parts of this statement.
See It Now (1954)
Context: No one familiar with the history of this country can deny that congressional committees are useful. It is necessary to investigate before legislating, but the line between investigating and persecuting is a very fine one and the junior Senator from Wisconsin has stepped over it repeatedly. His primary achievement has been in confusing the public mind as between the internal and the external threats of communism. We must not confuse dissent with disloyalty. We must remember always that accusation is not proof and that conviction depends upon evidence and due process of law. We will not walk in fear, one of another. We will not be driven by fear into an age of unreason, if we dig deep in our history and our doctrine, and remember that we are not descended from fearful men — not from men who feared to write, to speak, to associate and to defend causes that were, for the moment, unpopular. This is no time for men who oppose Senator McCarthy's methods to keep silent, or for those who approve. We can deny our heritage and our history, but we cannot escape responsibility for the result. There is no way for a citizen of a republic to abdicate his responsibilities. As a nation we have come into our full inheritance at a tender age. We proclaim ourselves, as indeed we are, the defenders of freedom, wherever it continues to exist in the world, but we cannot defend freedom abroad by deserting it at home. The actions of the junior Senator from Wisconsin have caused alarm and dismay amongst our allies abroad, and given considerable comfort to our enemies. And whose fault is that? Not really his. He didn't create this situation of fear; he merely exploited it — and rather successfully. Cassius was right. "The fault, dear Brutus, is not in our stars, but in ourselves." Good night, and good luck.

As quoted in Anarchism: From Theory to Practice, Daniel Guérin, New York: NY, Monthly Review Press (1970) p. 31

"The Abolition of Torture" http://www.tnr.com/doc.mhtml?pt=dcGGvZpeEnhgPCp2PwTGAy%3D%3D, The New Republic (19 December 2005)
Context: Monsters remain human beings. In fact, to reduce them to a subhuman level is to exonerate them of their acts of terrorism and mass murder — just as animals are not deemed morally responsible for killing. Insisting on the humanity of terrorists is, in fact, critical to maintaining their profound responsibility for the evil they commit.
And, if they are human, then they must necessarily not be treated in an inhuman fashion. You cannot lower the moral baseline of a terrorist to the subhuman without betraying a fundamental value. That is why the Geneva Conventions have a very basic ban on "cruel treatment and torture," and "outrages upon personal dignity, in particular humiliating and degrading treatment" — even when dealing with illegal combatants like terrorists. That is why the Declaration of Independence did not restrict its endorsement of freedom merely to those lucky enough to find themselves on U. S. soil — but extended it to all human beings, wherever they are in the world, simply because they are human.