The book is described as being controversial but irrefutable, from the standpoint of a secular view. It stated that joy, sorrow, memories, ambitions, identity, and free will are chemical responses in the brain.
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you, your joys and your sorrows, your memories and your ambitions, your sense of personal identity and free will are all in fact no more than the behavior of a vast assembly of nerve cells and their associated molecules.
your thoughts and your feelings like you say love matters, people matter, human beings matter. Those are thoughts, those are feelings but actually he says they're chemical responses. They're chemical things happening in your brain.
Well why are you having those chemical responses? He says well science will tell you because your ancestors had those particular chemical responses in their brain which led to behavior that enabled them to survive.
And all the people who didn't have those particular chemical responses in their brain, who didn't think those thoughts, because they didn't think those thoughts, they did not survive.
