The progress we have made in 2000 years:
For what the flesh desires is opposed to the Spirit, and what the Spirit desires is opposed to the flesh; for these are opposed to each other, to prevent you from doing what you want.
— St. Paul, Galatians 5:171
My flesh is under stimulus control. Our brains, like rat brains, are wired so that food and sex give us little bursts of dopamine, the neurotransmitter that is the brain’s way of making us enjoy the activities that are good for the survival of our genes.
— Jonathan Haidt, The Happiness Hypothesis, Basic Books, 2006.