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You have to write the book that wants to be written. And if the book will be too difficult for grown-ups, then you write it for children.

Joy sparks the urge to play, interest sparks the urge to explore, contentment sparks the urge to savor and integrate, and love sparks a recurring cycle of each of these urges within safe, close relationships.

The march of invention has clothed mankind with powers of which a century ago the boldest imagination could not have dreamt.