Dennis Szilak's List: Twain

"Of all the animals, man is the only one that is cruel.\n He is the only one that inflicts pain \nfor the pleasure of doing it.\n It is \na trait that is not known to the higher animals.\n The cat plays with the frightened mouse; \nbut she has this excuse, that she does not know that the mouse is \nsuffering.\n The cat is moderate \n(unhumanly moderate: she only scares the mouse, she does not hurt it; she doesnt \ndig out its eyes, or tear off its skin, or drive splinters under its nails) \nman-fashion; when she is done playing with it she makes a sudden meal of it and \nputs it out of its trouble.\n Man is \nthe Cruel Animal.\n He is alone in that distinction."

skeptically.org/logicalthreads/id14.html

http://twainquotes.com/Man.html