"The love for all living creatures is the most noble attribute of man."
"Looking to future generations, there is no cause to fear that the social instincts will grow weaker... the social instincts, - the prime principle of man's moral constitution - with the aid of active intellectual powers and the effects of habit, naturally lead to the golden rule, "As ye would that men should do to you; do ye to them likewise"; and this lies at the foundation of morality."
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Source: The Descent of Man. Book by Charles Darwin, part I, chap. IV, 1871.
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