What does not kill me makes me stronger

What does not kill me makes me stronger (German Was mich nicht umbringt macht mich stärker) is part of aphorism number 8 from the "Maxims and Arrows" section of Friedrich Nietzsche's Twilight of the Idols (1888). In full, it is:

Aus der Kriegsschule des Lebens. — Was mich nicht umbringt, macht mich stärker.
Out of life’s school of war — What does not kill me makes me stronger.

It is quoted or alluded to by many other works, with minor variants in wording:

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