“We generally describe the most repulsive examples of humanity's cruelty as brutal or bestial, implying by these adjectives that such behaviour is characteristic of less highly developed animals such as ourselves. In truth, however, the extremes of 'brutal' behaviour are confined to humanity; and there is no parallel in nature to our savage treatment of each other. ”
“We judge ourselves by our intentions and others by their behaviour.”
“Brutality to an animal is cruelty to mankind - it is only the difference in the victim.”
“I am always incorrigibly interested in the behaviour of the 'human animal', and look forward to perusing divers effusions of your lively pen.”
“Struggle is the father of all things. It is not by the principles of humanity that man lives or is able to preserve himself above the animal world, but solely by means of the most brutal struggle.”
“I sometimes think that animals are incapable of the kinds of cruelty that humans willingly inflict on each other.”