"Everything is sold to skill and labor; and where nature furnishes the materials, they are still rude and unfinished, till industry, ever active and intelligent, refines them from their brute state, and fits them for human use and convenience."

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All your trouble comes from lack of exercise. A man of your strength and constitution ought always to have kept physically active. So don't jibe at the very wise advice that sentences you to one hour's walk a day. You imagine the work of the mind takes place only in the brain; but you're much mistaken. It takes place in the legs as well.

— George Sand