"One would not expect to see such an ambitious book in ethics and the philosophy of religion written by a veterinarian, even an academic one. But in addition to knowing a great deal about animals and a lot about evolutionary biology, Broom has read extensively in the writings of ethicists, philosophers, biologists, and psychologists, especially those who believe evolutionary theory has something to contribute to an understanding of human morality." - The Journal of Religion Don Browning, University of Chicago
Many philosophers and theologians write about morality and its origins without reference to biological processes such as evolution. In turn, biologists discuss phenomena of importance to human morality and religion without taking account of the ideas of those who think deeply about these subjects. Donald Broom argues that morality and the central components of religion are of great value, and presents two central ideas : that morality has a biological foundation and has evolved as a consequence of natural selection, and secondly, that religions are essentially structures underpinning morality.