If you are in a hurry or need the quickest possible recap, we can summarise the entire book with

Fulfill your true needs and eliminate your false needs.

or with

For a quick kick and short-term satisfaction, choose big reward and small effort. For deeper more lasting satisfaction, choose smaller reward and greater effort.

or like this

"My miracle is When I'm hungry I eat When I'm tired I sleep”

˜ Zen Buddhist proverb ˜