Friedrich Nietzsche said this quote

“ The life of the enemy . Whoever lives for the sake of combating an enemy has an interest in the enemy's staying alive. ”

Famous Quotes of Friedrich Nietzsche

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That which does not kill us makes us stronger.

~ Friedrich Nietzsche

It is not a lack of love, but a lack of friendship that makes unhappy marriages.

~ Friedrich Nietzsche

There is always some madness in love. But there is also always some reason in madness.

~ Friedrich Nietzsche

The man of knowledge must be able not only to love his enemies but also to hate his friends.

~ Friedrich Nietzsche