Before epilepsy was understood to be a neurological condition, people believed it was caused by the moon, or by phlegm in the brain. They condemned seizures as evidence of witchcraft or demonic possession, and killed or castrated sufferers to prevent them from passing tainted blood to a new generation.
He argues that free will is a myth and we should accept it, but if our choices are predetermined, how do we even choose to accept or reject anything?
That’s more a technicality vs practicality aspect. Even if we technically don’t have free will, the way our minds work make us feel like we have free will. The “accept it” aspect of the argument is appealing to us feeling like we make our own decisions, even if ultimately we didn’t actually make the choice to accept it.