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— Frederick William Robertson"As the tree is fertilized by its own broken branches and fallen leaves, and grows out of its own decay, so men and nations are bettered and improved by trial, and refined out of broken hopes and blighted expectations."
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The tree of life should perhaps be called the coral of life, base of branches dead; so that passages cannot be seen-this again offers contradiction to constant succession of germs in progress.
— Charles Darwin
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The History of Evolution is the real source of light in the investigation of organic bodies. It is applicable at every step, and all our ideas of the correlation of organic bodies will be swayed by our knowledge of the history of evolution. To carry the proof of it into all branches of research would be an almost endless task. (1828)
— Karl Ernst von Baer
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