In a nutshell: we evolved happiness. It’s our reward for satisfying short-term and long-term innate needs.
One of those long-term needs is to feel safe, and the best way to feel safe is to feel resilient – to feel that whatever happens in life, we can handle it.
Another is to feel connected with ‘the tribe’. The best way to feel connected with the tribe is to feel that we contribute to the tribe and feel valued for our contribution.
There are other long-term innate needs, but this book looks at how we can satisfy those big two, and in the process, build ourselves person who is happy.
The entire book is below. The chapter headings are to the side.