Tacitus

Be assured those will be thy worst enemies, not to whom thou hast done evil, but who have done evil to thee. And those will be thy best friends, not to whom thou hast done good, but who have done good to thee.
Be assured those will be thy worst enemies, not to whom thou hast done evil, but who have done evil to thee. And those will be thy best friends, not to whom thou hast done good, but who have done good to thee.
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These are some quotes by Roman author Tacitus Historian, who lived between 55 and 120.