Work is less boring than amusing oneself. [Baudelaire, "Mon Coeur mis a nu," 1862]
In Old English, the noun also had the sense of "fornication." Workhouse in the sense of "place where the poor or petty criminals are lodged" first appeared 1650s. Works "industrial place" (usually with qualifying adj.) is attested from 1580s. Work ethic recorded from 1959.