All things considered, it cannot be said that humankind has lacked the courage to back its resolutions. Billions of parents, in every age and in every culture, have sacrificed themselves for their children, and thereby made life more meaningful for themselves. Probably as many have devoted all their energies to preserving their fields and their flocks. Millions more have surrendered everything for the sake of their religion, their country, or their art. For those who have done so consistently, despite pain and failure, life as a whole had a chance to become like an extended episode of flow: a
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