Most of the more complex emotions are common to the higher animals and ourselves. Every one has seen how jealous a dog is of his master's affection, if lavished on any other creature; and I have observed the same fact with monkeys. This shews that animals not only love, but have the desire to be loved.
Charles DarwinRelated topics
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No science of any kind can be divorced from ethical considerations... Science is a human learning process which arises in certain subcultures in human society and not in others, and a subculture as we seen is a group of people defined by acceptance of certain common values, that is, an ethic which permits extensive communication between them.
Kenneth Boulding
For human nature, being more highly pitched, selved, and distinctive than anything in the world, can have been developed, evolved,condensed, from the vastness of the world not anyhow or by the working of common powers but only by one of finer or higher pitch and determination than itself.
Gerard Manley Hopkins