"The love for all living creatures is the most noble attribute of man."
"Consequently, if my theory be true, it is indisputable that before the lowest Silurian stratum was deposited, long periods elapsed, as long as, or probably far longer than, the whole interval from the Silurian age to the present day; and that during these vast, yet quite unknown, periods of time, the world swarmed with living creatures. To the question why we do not find records of these vast primordial periods, I can give no satisfactory answer."
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Source: Charles Darwin (1866). “On the origin of species ... A facsimile of the first edition, with an introduction by Ernst Mayr. With a portrait and a bibliography”, p.370
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