"As Aristotle said, happiness is not a condition that is produced or stands on its own; rather, it is a frame of mind that accompanies an activity. But another frame of mind comes first. It is a steely determination to do well."

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In the dark room a cloud of yellow dust flew from beneath the tool like a scatter of sparks from under the hooves of a galloping horse. The twin wheels turned and hummed. Binet was smiling, his chin down, his nostrils distended. He seemed lost in the kind of happiness which, as a rule, accompanies only those mediocre occupations that tickle the intelligence with easy difficulties, and satisfy it with a sense of achievement beyond which there is nothing left for dreams to feed on.

— Gustave Flaubert