大自然並不殘忍，只是無情的冷漠。這是人類最難學懂的其中一課。我們無法承認有些事物既不善良也不邪惡，既不殘酷也不仁慈，只是單純地冷酷無情 —— 對一切苦難漠不關心，也無目的。
—理查．道金斯（演化生物學家）
“Nature is not cruel, only pitilessly indifferent. This is one of the hardest lessons for humans to learn. We cannot admit that things might be neither good nor evil, neither cruel nor kind, but simply callous – indifferent to all suffering, lacking all purpose.”
—Richard Dawkins, evolutionary biologist
