The manual worker is no longer kept down by over-fatigue, and the brainworker is no longer cut off from the rest of the people.    From Wordnik.com.  [The New Society] Reference

By the principle of Interchange of Labour it is required that every employee engaged in mechanical work can claim to do a portion of his day's work in intellectual employment; and that every brainworker shall be obliged to devote a portion of his day to physical labour.    From Wordnik.com.  [The New Society] Reference