“Of all the animals, man is the only one that is cruel. He is the only one that inflicts pain for the pleasure of doing it.”

“Heaven is by favor; if it were by merit your dog would go in and you would stay out. Of all the creatures ever made (man) is the most detestable. Of the entire brood, he is the only one... that possesses malice. He is the only creature that inflicts pain for sport, knowing it to be pain.”

“Each man's preference is the only standard for him, the only one which he can accept, the only one which can command him.”

“Man is the only animal that deals in that atrocity of atrocities War. He is the only one that gathers his brethren about him and goes forth in cold blood and calm pulse to exterminate his kind. He is the only animal that for sordid wages will march out... and help to slaughter strangers of his own species who have done him no harm and with whom he has no quarrel.... And in the intervals between campaigns he washes the blood off his hands and works for the universal brotherhood of man with his mouth.”

“Man is the only animal that blushes. Or needs to.”

“He said that man’s heart was the only bad heart in the animal kingdom; that man was the only animal capable of feeling malice, envy, vindictiveness, revengefulness, hatred, selfishness, the only animal that loves drunkenness, almost the only animal that could endure personal uncleanliness and a filthy habitation, the sole animal in whom was fully developed the base instinct called patriotism, the sole animal that robs, persecutes, oppresses and kills members of his own tribe, the sole animal that steals and enslaves the members of any tribe.”

“Man is the only animal who blushes...or needs to.”