The final chapter reviews points from earlier chapters, and Darwin concludes by hoping that his theory might produce revolutionary changes in many fields of natural history. Although he avoids the controversial topic of human origins in the rest of the book <answer>so as not to prejudice readers against his theory</answer>, here he ventures a cautious hint that psychology would be put on a new foundation and that "Light will be thrown on the origin of man". Darwin ends with a passage that became well known and much quoted:
Why did Darwin avoid the topic of the origins of humans in most of his book?
so as not to prejudice readers against his theory