interest is one source of passion
Page 143 interest is one source of passion. Purpose the intention to contribute to the well-being being of others, is another. The mature passions of greedy people depend on both.
— from Enjoy the Flight (Living/Balance/Happiness/Passion) · Grit Angela duckworth kat dictation
In the book
And remember the hierarchy: interest is one source of passion, but purpose — the intention to contribute to others — is the other, and the most durable passions draw on both. Purpose, in the end, trumps passion. Keep your balance by moving. Einstein said life is like riding a bicycle: to keep your balance, you have to keep moving. […] Buy experiences, schedule joy. Spend on moments, not objects; block weekly time for your top five sources of happiness. Feed a passion, and let it serve a purpose. Discover, develop, deepen — and aim it at contributing to others. Keep your balance by moving. Tend every area of life and take play seriously. — Enjoy the Flight (Living/Balance/Happiness/Passion)