It is always safe to learn, even from our enemies; seldom safe to venture to instruct, even our friends.
If you want enemies, excel others; if you want friends, let others excel you.
The sun should not set upon our anger, neither should he rise upon our confidence. We should forgive freely, but forget rarely. I will not be revenged, and this I owe to my enemy; but I will remember, and this I owe to myself.
Religion has treated knowledge sometimes as an enemy, sometimes as a hostage; often as a captive and more often as a child; but knowledge has become of age, and religion must either renounce her acquaintance, or introduce her as a companion and respect her as a friend.
History of warfare has not yet enabled any army, any civilized army, the army of a democracy like Israel, to be able to deal with a ruthless terrorist enemy that uses civilians as a human shield without having some incidental civilian casualties.
But ... the days that the Jewish people remain passive in the face of genocidal enemies — those days are over.
According to the faith and mercy of his Christian enemies, [Chosroes] sunk without hope into a still deeper abyss [Hell]; and it will not be denied, that tyrants of every age and sect are the best entitled to such infernal abodes.
The Roman government appeared every day less formidable to its enemies, more odious and oppressive to its subjects.
Fear has been the original parent of superstition, and every new calamity urges trembling mortals to deprecate the wrath of their invisible enemies.
The separation of the Arabs from the rest of mankind has accustomed them to confound the ideas of stranger and enemy.