I was thinking Henry VI, Part 2, Act IV, Scene 2, personally.
BEVIS: O miserable age! virtue is not regarded in handicraftsmen.
HOLLAND: The nobility think scorn to go in leather aprons.
BEVIS: Nay, more, the king's council are no good workmen.
HOLLAND: True; and yet it is said, labour in thy vocation; which is as much to say as, let the magistrates be labouring men; and therefore should we be magistrates.
BEVIS: Thou hast hit it; for there's no better sign of a brave mind than a hard hand...