“The doctrine of human dignity says that humans merit a level of moral concern wholly different from that accorded to mere animals; for this to be true, there would have to be some big, morally significant difference between them. Therefore, any adequate defense of human dignity would require some conception of human beings as radically different from other animals. But that is precisely what evolutionary theory calls into question. It makes us suspicious of any doctrine that sees large gaps of any sort between humans and all other creatures. This being so, a Darwinian may conclude that a successful defense of human dignity is most unlikely.”
Created from Animals (1990), p. 172
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James Rachels 6
American philosopher 1941–2003Related quotes
Source: The Animal Welfare Movement and the Foundations of Ethics, p. 89

19 September 2013 during his speech at the Valdai forum
2013

“The only difference between a human and an animal is in having inspiration.”

Truman Library address (2006)
Context: Both security and development ultimately depend on respect for human rights and the rule of law.
— Although increasingly interdependent, our world continues to be divided — not only by economic differences, but also by religion and culture. That is not in itself a problem. Throughout history, human life has been enriched by diversity, and different communities have learnt from each other. But, if our different communities are to live together in peace we must stress also what unites us: our common humanity, and our shared belief that human dignity and rights should be protected by law.

Rudd's new vision for the nation, 5 December 2006, 13 February 2008, ABC Local Radio http://www.abc.net.au/am/content/2006/s1804299.htm,
2006