Montesquieu

Monarchy does not des­troy itself the way the des­po­tic state does, but a state of midd­ling size could be swiftly inva­ded. It the­re­fore has for­ti­fi­ca­tions to defend its bor­ders, and armies to defend its for­ti­fi­ca­tions. The smal­lest ter­rain is fought over with art, cou­rage, and deter­mi­na­tion. Despotic sta­tes make incur­sions upon each other ; only monar­chies wage war.

Fortifications belong to monar­chies ; des­po­tic sta­tes fear having any. They dare entrust them to no one, for no one there loves the state and the prince.