“Evil people naturally assume that you will use that power exactly as they would use it.”

Source: The Amber Spyglass

As Lessing says, 'Let the devil catch you but by a single hair, and you are his forever.'
Source: A Dictionary of Thoughts, 1891, p. 152.

Listen, Little Man! (1948)

55 min 20 sec
Cosmos: A Personal Voyage (1990 Update), Who Speaks for Earth? [Episode 13]
Context: Since this series' maiden voyage, the impossible has come to pass: Mighty walls that maintained insuperable ideological differences have come tumbling down; deadly enemies have embraced and begun to work together. The imperative to cherish the Earth and protect the global environment that sustains all of us has become widely accepted, and we've begun, finally, the process of reducing the obscene number of weapons of mass destruction. Perhaps we have, after all, decided to choose life. But we still have light years to go to ensure that choice. Even after the summits and the ceremonies and the treaties, there are still some 50,000 nuclear weapons in the world — and it would require the detonation of only a tiny fraction of them to produce a nuclear winter, the predicted global climatic catastrophe that would result from the smoke and the dust lifted into the atmosphere by burning cities and petroleum facilities.
The world scientific community has begun to sound the alarm about the grave dangers posed by depleting the protective ozone shield and by greenhouse warming, and again we're taking some mitigating steps, but again those steps are too small and too slow. The discovery that such a thing as nuclear winter was really possible evolved out of the studies of Martian dust storms. The surface of Mars, fried by ultraviolet light, is also a reminder of why it's important to keep our ozone layer intact. The runaway greenhouse effect on Venus is a valuable reminder that we must take the increasing greenhouse effect on Earth seriously.
Important lessons about our environment have come from spacecraft missions to the planets. By exploring other worlds we safeguard this one. By itself, I think this fact more than justifies the money our species has spent in sending ships to other worlds. It is our fate to live during one of the most perilous and, at the same time, one of the most hopeful chapters in human history.
Our science and our technology have posed us a profound question. Will we learn to use these tools with wisdom and foresight before it's too late? Will we see our species safely through this difficult passage so that our children and grandchildren will continue the great journey of discovery still deeper into the mysteries of the Cosmos? That same rocket and nuclear and computer technology that sends our ships past the farthest known planet can also be used to destroy our global civilization. Exactly the same technology can be used for good and for evil. It is as if there were a God who said to us, “I set before you two ways: You can use your technology to destroy yourselves or to carry you to the planets and the stars. It's up to you.”

From Her Books, I Have Chosen To Stay And Fight, ACTIVISM

J. K. Rowling, as quoted in ‪Harry Potter's Bookshelf : The Great Books Behind the Hogwarts Adventures‬ (2009) by John Granger <!-- also partly in Biography Today : Profiles of People of Interest to Young Readers Vol. 17, Issue 1 (2008), p. 142 -->
2000s
Context: I think most of us if you were asked to name a very evil regime would think of Nazi Germany. … I wanted Harry to leave our world and find exactly the same problems in the Wizarding world. So you have to the intent to impose a hierarchy, you have bigotry, and this notion of purity, which is a great fallacy, but it crops up all over the world. People like to think themselves superior and that if they can pride themselves on nothing else, they can pride themselves on perceived purity. … The Potter books in general are a prolonged argument for tolerance, a prolonged plea for an end to bigotry, and I think it's one of the reasons that some people don't like the books, but I think that it's a very healthy message to pass on to younger people that you should question authority and you should not assume that the establishment or the press tells you all of the truth.

Jacob Black, p. 599
Twilight series, Eclipse (2007)

Source: A Dictionary of Thoughts, 1891, p. 152.

NPR Interview January 2007, regarding current uses of the camera phone http://weekendamerica.publicradio.org/programs/2007/01/06/father_of_the_camera.html.