"If you need a certain vitality you can only supply it yourself, or there comes a point, anyway, when no one's actions but your own seem dramatically convincing and justifiable in the plot that the number of your days concocts."

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Preserve the core, and let the rest flux. In their wonderful bestseller Built to Last, authors James Collins and Jerry Porras make a convincing argument that long-lived companies are able to thrive 50 years or more by retaining a very small heart of unchanging values, and then stimulating progress in everything else. At times "everything" includes changing the business the company operates in, migrating, say, from mining to insurance. Outside the core of values, nothing should be exempt from flux. Nothing.

— Kevin Kelly