It is clear that the monarch who, through bad counsel or negligence, ceases to see that the laws are executed can easily repair the damage: he has only to get a new counsellor, or correct his own negligence. But when, in a popular government, the laws have ceased to be executed, since this can result only from corruption of the republic, the state is already undone.

[Il est clair encore que le monarque qui, par mauvais conseil ou par négligence, cesse de faire exécuter les loix, peut aisément réparer le mal ; il n’a qu’à changer de conseil, ou se corriger de cette négligence même. Mais lorsque, dans un gouvernement populaire, les loix ont cessé d’être exécutées, comme cela ne peut venir que de la corruption de la république, l’état est déja perdu.]

Charles-Lewis de Secondat, Baron de Montesquieu (1689-1755) French political philosopher

Spirit of Laws [The Spirit of the Laws; De l’esprit des lois], Book 3, ch. 3 (1748) [tr. Stewart (2018)]
    (Source)

(Source (French)). Other translations:

Clear it is also that a monarch, who through bad advice or indolence ceases to enforce the execution of the laws, may easily repair the evil: he has only to follow other advice; or to shake off this indolence. But when in popular government, there is a suspension of the laws, as this can proceed only from the corruption of the republic, the state is certainly undone.
[tr. Nugent (1750)]

It is also clear that the monarch who ceases to see to the execution of the laws, though bad counsel or negligence, may easily repair the damage; he has only to change his counsel or correct his own negligence. But in a popular government when the laws have ceased to be executed, as this can only come from the corruption of the republic, the state is already lost.
[tr. Cohler/Miller/Stone (1989)]