"A high place of honor, although doubtless one to be obtained only after enduring the pangs of a prolonged crucifixion, awaits that philosophical biologist, or that philosopher sufficiently acquainted with scientific biology, who subjects the modern doctrine of evolution to a thoroughly critical analysis, with a view to detect and to estimate its metaphysical assumptions."

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Philosophy, like science, consists of theories or insights arrived at as a result of systemic reflection or reasoning in regard to the data of experience. It involves, therefore, the analysis of experience and the synthesis of the results of analysis into a comprehensive or unitary conception. Philosophy seeks a totality and harmony of reasoned insight into the nature and meaning of all the principal aspects of reality.

— Joseph Alexander Leighton