The love of action is a principle of a much stronger and more doubtful nature. It often leads to anger, to ambition, and to revenge; but when it is guided by the sense of propriety and benevolence, it becomes the parent of every virtue, and, if those virtues are accompanied with equal abilities, a family, a state, or an empire may be indebted for their safety and prosperity to the undaunted courage of a single man.

The History of the Decline and Fall of the Roman Empire - Volume the First (ed. 1776)