Philosophy
Ikigai
The Japanese idea of a reason to get up in the morning — and the small habits that keep Okinawans going past 100.
Why it's on the shelf
This gave me a calmer way to think about purpose. The overlap of what you love, what you're good at, what the world needs, and what you can be paid for is a neat lens — even if real life is messier than a Venn diagram.
The part that stuck wasn't the philosophy, it was the ordinary habits: staying lightly busy, eating until you're 80% full, keeping your people close. Small, boring, repeatable.