Plutarch Praecepta gerendae reipublicae 23

[23] One should, however, always vie with every official in zeal, forethought for the common good, and wisdom; if they are worthy men, by voluntarily suggesting and pointing out the things to be done and allowing them to make use of well-considered ideas and to be held in high esteem because they are benefactors of the community. But if there is in them any reluctance, delay, or ill-will as to putting such suggestions into effect, then a man ought to come forward of himself and address the people, and he should not neglect or slight the public interests on the ground that because someone else is in office it is not proper for him to meddle and mix in the administration of affairs. For the law always gives the first rank in the government to him who does what is right and recognizes what is advantageous. Now there was, says he, ¹ in the army a man named Xenophon, neither a general nor a captain, ² but by perceiving what was needed and daring to do it he put himself in command and saved the Greeks. And of Philopoemen’s deeds the most brilliant is this, that when Nabis had taken Messenê, and the general of the Achaeans was so cowardly that he would not go to the assistance of the place, he himself with the most eager patriots set out and took the city without any decree of the council. Certainly it is well to make innovations, not for the sake of small or casual matters, but in cases of necessity, as Philopoemen did, or for glorious causes, as Epameinondas did when contrary to the law he added four months to the Boeotarchy, ³ in which time he invaded Laconia and carried out his measures at Messenê ⁴ ; so that if any accusation or blame be brought against us on this account we may have necessity as our defence against the charge, or the greatness and glory of the action as a consolation for the risk.