But the greater the difficulty, the greater the glory; for no occasion arises that can excuse a man for being guilty of injustice. {65} So then, not those who do injury but those who prevent it are to be considered brave and courageous.
 Marcus Tullius Cicero, On Duties (44 BC). copy citation

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Author Marcus Tullius Cicero
Source On Duties
Topic difficulty injustice
Date 44 BC
Language English
Reference
Note Translated by Walter Miller
Weblink http://www.constitution.org/rom/de_officiis.htm

Context

“The result is that such men do not allow themselves to be constrained either by argument or by any public and lawful authority; but they only too often prove to be bribers and agitators in public life, seeking to obtain supreme power and to be superiors through force rather than equals through justice. But the greater the difficulty, the greater the glory; for no occasion arises that can excuse a man for being guilty of injustice. {65} So then, not those who do injury but those who prevent it are to be considered brave and courageous. Moreover, true and philosophic greatness of spirit regards the moral goodness to which Nature most aspires as consisting in deeds, not in fame, and prefers to be first in reality rather than in name. And we must approve this view; for he who depends upon the caprice of the ignorant rabble cannot be numbered among the great.” source