“For the human race is, more than any other species, at once social by nature and quarrelsome by perversion.”

“Confusing monogamy with morality has done more to destroy the conscience of the human race than any other error.”

“The human race is challenged more than ever before to demonstrate our mastery, not over nature but of ourselves.”

“Having people in different optimal environments increases the chances of survival of the human race as a whole. It is nature's way to preserve her species.”

“Humanity is part of nature, a species that evolved among other species. The more closely we identify ourselves with the rest of life, the more quickly we will be able to discover the sources of human sensibility and acquire the knowledge on which an enduring ethic, a sense of preferred direction, can be built.”

“The fact is that more people have been slaughtered in the name of religion than for any other single reason. That, that my friends, that is true perversion!”