Animals, James A. Froude

Wild animals never kill for sport. Man is the only one to whom the torture and death of his fellow creatures is amusing in itself.

- James A. Froude, Oceana, or, England and Her Colonies (1886) [C. Scribner's Sons, 1972, ISBN 083699096X, 9780836990966, 396 pages], p. 67

http://en.wikiquote.org/wiki/James_Anthony_Froude

Death, Grand Inquisitor Silecio

Our bodies are prisons for our souls. Our skin and blood, the iron bars of confinement. But fear not. All flesh decays. Death turns all to ash. And thus, death frees every soul.

- Grand Inquisitor Silecio, in The Fountain, screenplay by Darren Aronofsky.

http://en.wikiquote.org/wiki/Death

Mind, Isaac Asimov

It is the nature of the mind that makes individuals kin, and the differences in the shape, form or manner of the material atoms out of whose intricate relationships that mind is built are altogether trivial.

- Isaac Asimov, The Beginning and the End (1977) as quoted in Todd Siler, Breaking the Mind Barrier (1997)

http://en.wikiquote.org/wiki/Mind