No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full.
--
His self-made epitaph, as quoted in Heroes of History : A Brief History of Civilization from Ancient Times to the Dawn of the Modern Age (2001) by Will Durant; variant translation: "...nor enemy harmed me"Lucius Cornelius Sulla
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An enemy might at any time become a friend, but while an enemy was an enemy he should be trodden on and persecuted.
Anthony Trollope
The enemy of my enemy is my friend, so that makes Google my best friend.
Marc Benioff
That city in which those who are not wronged, no less than those who are wronged, exert themselves to punish the wrongdoers.
Solon
To oblige a friend by inflicting an injury on his enemy is often more easy than to confer a benefit on the friend himself.
Anthony Trollope
Epops: The wise can often profit by the lessons of a foe, for caution is the mother of safety. It is just such a thing as one will not learn from a friend and which an enemy compels you to know. To begin with, it's the foe and not the friend that taught cities to build high walls, to equip long vessels of war; and it's this knowledge that protects our children, our slaves and our wealth.
Leader of the Chorus [leader]: Well then, I agree, let us first hear them, for that is best; one can even learn something in an enemy's school.
(tr. O'Neill 1938, Perseus)Aristophanes
Sulla, Lucius Cornelius
Sullavan, Margaret
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