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- "Heresies are experiments in man's unsatisfied search for truth."
- "You have learned something. That always feels at first as if you had lost something."
- "His studies were pursued but never effectually overtaken."
- "When the history of civilization is written, it will be a biological history and Margaret Sanger will be its heroine."
- "The forceps of our minds are clumsy things and crush the truth a little in the course of taking hold of it."



