One general law, leading to the advancement of all organic b... - Charles Darwin, The Origin of Species
"One general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die."
More quotes by Charles Darwin, The Origin of Species
"Nothing is easier than to admit in words the truth of the universal struggle for life, or more difficult--at least I have found it so--than constantly to bear this conclusion in mind."