"I wish to suggest that a man may be very industrious, and yet may not spend his time well," wrote Henry David Thoreau a century and a half before his society had stuffed its white-collar workers into cubicles with computers. His point, made as part of a longer series of lectures, boiled down to the notion that if you don't sustain yourself with love for what you do, whatever you're doing might be sort of worthless--or worse, without principle or enjoyment.
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