There is the growing influence of biology and the application of biological principles to the human faculties, thought among the rest. Man is said to have brains because they enable him to survive. Intelligence is construed as an organic function and reason as developed or evolved intelligence.

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Quote text and notes from Wikiquote: Ralph Barton Perry (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.