“Evolution brings human beings. Human beings, through a long and painful process, bring humanity.”

"Idealism in International Politics", Rectoral Address at Glasgow University (7 November, 1923).
Quoted in The Times, 8 November 1923, according to "Guarantee of Peace: The League of Nations in British Policy 1914-1925" by Peter J. Yearwood, pg 280
Context: Politically, economically and philosophically the motive of self-interest not only is but must... and ought to be the mainspring of human conduct... For as long a time as the records of history have been preserved human societies passed through a ceaseless process of evolution and adjustment. This process has sometimes been pacific, but more often it has resulted from warlike disturbance. The strength of different nations, measured in terms of arms, varies from century to century. The world continues to offer glittering prizes to those who have stout hearts and sharp swords; it is therefore extremely improbable that the experience of future ages will differ in any material respect from that which has happened since the twilight of the human race … it is for us who, in our history have proved ourselves a martial … people … to maintain in our own hands the adequate means for our own protection and … to march with heads erect and bright eyes along the road of our imperial destiny.

"Runaround" in Astounding Science Fiction (March 1942); later published in I, Robot (1950)
The Three Laws of Robotics (1942)
Variant: A robot may not injure a human being, or, through inaction, allow a human being to come to harm.

Remark to Gen. Edward H. Ripley (5 April 1865), recalled during Ripley's speech http://books.google.com/books?id=1OoSAAAAYAAJ&pg=PA353&dq=believe at the 41st annual meeting of the Reunion Society of Vermont Officers (1 November 1904)
Posthumous attributions

Speech to the Third Army (1944)
Context: Every man is scared in his first battle. If he says he's not, he's a liar. Some men are cowards but they fight the same as the brave men or they get the hell slammed out of them watching men fight who are just as scared as they are. The real hero is the man who fights even though he is scared. Some men get over their fright in a minute under fire. For some, it takes an hour. For some, it takes days. But a real man will never let his fear of death overpower his honor, his sense of duty to his country, and his innate manhood. Battle is the most magnificent competition in which a human being can indulge. It brings out all that is best and it removes all that is base.

“We cannot help but use the people below us as a resource, my love,” said her two MOHmies, as one. “That is what it means to be in power. Your choice is to relinquish power forever, or to accept that and use people for good.”...
“If we are powerful,” sang her MOHmies, “we can make things better, but we are made unclean by the fact that we have power. If we are powerless we remain clean, but we cannot make things better.”
Part 2, Chapter 13, “Of Multitudes” (p. 240).
Jack Glass (2012)

Source: 1984

The Enormous Room (1922)