Allyson Gray

“If possessing a higher degree of intelligence does not entitle one human to use another for his or her own ends, how can it entitle humans to exploit non-humans?”
― Peter Singer, Animal Liberation

“To a man whose mind is free there is something even more intolerable in the sufferings of animals than in the sufferings of man. For with the latter it is at least admitted that suffering is evil and that the man who causes it is a criminal. But thousands of animals are uselessly butchered every day without a shadow of remorse. If any man were to refer to it, he would be thought ridiculous. And that is the unpardonable crime.”
― Romain Rolland

“The time will come when men such as I will look upon the murder of animals as they now look on the murder of men.”
― Leonardo da Vinci

“It is arguable […] that a further effect of our partiality for members of our own species is a tendency to decreased sensitivity to the lives and well-being of those sentient beings that are not members of our species.

One can discern an analogous phenomenon in the case of nationalism. It frequently happens that the sense of solidarity among the members of a nation motivates them to do for one another all that—and perhaps even more than—they are required to do by impartial considerations. But the powerful sense of collective identity within a nation is often achieved by contrasting an idealized conception of the national character with caricatures of other nations, whose members are regarded as less important or worthy or, in many cases, are dehumanized and despised as inferior or even odious. When nationalist solidarity is maintained. in this way—as it has been in recent years in such places as Yugoslavia and its former provinces—the result is often brutality and atrocity on an enormous scale. Thus, while nationalist sentiment may have beneficial effects within the nation, these are greatly outweighed from an impartial point of view by the dreadful effects that it has on relations between nations.”
― Jeff McMahan, Ethics of Killing: Problems at the Margins of Life