"When physics, chemistry, biology, medicine, contribute to the detection of concrete human woes and to the development of plans for remedying them and relieving the human estate, they become moral; they become part of the apparatus of moral inquiry or science? When the consciousness of science is fully impregnated with the consciousness of human value, the greatest dualism which now weighs humanity down, the split between the material, the mechanical and the scientific and the moral and ideal will be destroyed."

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I don't believe, for instance, that evolutionary biology or any scientific endeavor has much to say about love. I'm sure a lot can be learned about the importance of hormones and their effects on our feelings. But do the bleak implications of evolution have any impact on the love I feel for my family? Do they make me more likely to break the law of flaunt society's expectations of me? No. I simply does not follow that human relationships are meaningless just because we live in a godless universe subject to the natural laws of biology.

— Greg Graffin