Man could no longer be regarded as the Lord of Creation, a being apart from the rest of nature. He was merely the representative of one among many Families of the order Primates in the class Mammalia.
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He who is not content to look, like a savage, at the phenomena of nature as disconnected, cannot any longer believe that man is the work of a separate act of creation ... Man is the co-descendant with other mammals of a common progenitor.
Man selects only for his own good: Nature only for that of the being which she tends.
Man is descended from a hairy, tailed quadruped, probably arboreal in its habits.
I believe man . . . in the same predicament with other animals.
In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation. Light will be thrown on the origin of man and his history.
There is no fundamental difference between man and animals in their ability to feel pleasure and pain, happiness, and misery.
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