Anyone who wishes to speak in favour of a law must show that it affects all equally, that it harmonizes with the rest of the laws, and that it is beneficial to the city, particularly in promoting concord; failing this, he must show that it will conduce to virtue among the citizens or that it will benefit the public revenue or the good repute of the city as a whole, or that it will strengthen the power of the state, or that it will confer some similar advantage.