“A mind always employed is always happy. This is the true secret, the grand recipe for felicity. The idle are the only wretched. In a world which furnishes so many emploiments which are useful, and so many which are amusing, it is our own fault if we ever know what ennui is, or if we are ever driven to the miserable resource of gaming, which corrupts our dispositions, and teaches us a habit of hostility against all mankind.” – Thomas Jefferson, “Letter to Martha Jefferson”, May 21, 1787