I think one of the biggest challenges of modern life is how different our life has become from the conditions we evolved in as a species. In my experience, we are wired to be dissatisfied unless we fulfill biological goals (get food, create a safe environment for children, secure a position within the community, etc.) And yet we also cannot be happy unless we fulfill the values we are taught through upbringing.
How to reconcile the vegetarian with the hunter, I wonder?