"The love for all living creatures is the most noble attribute of man."
"Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult - at least I have found it so - than constantly to bear this conclusion in mind...We behold the face of nature bright with gladness...We do not see, or we forget, that the birds which are idly singing round us mostly live on insects and seeds, and are thus constantly destroying life."
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Source: Letter to J. D. Hooker, 13 July 1856
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"A man who dares to waste one hour of time has not discovered the value of life."
"The world will not be inherited by the strongest, it will be inherited by those most able to change."
"It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change, that lives within the means available and works co-operatively against common threats."
"Nothing exists for itself alone, but only in relation to other forms of life"
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