Grammar, which knows how to control even kings.
La grammaire qui sait régenter jusqu'aux rois.
Original text (French)
Notes from Wikiquote
Act II, sc. vi. An apparent reference to Sigismund I, at the Council of Constance, 1414, said to a prelate who had objected to his Majesty's grammar, "Ego sum rex Romanus, et supra grammaticam" (I am the king of Rome, and am above grammar).