taken from: thus spoke zarathustra, part II; 'on self-overcoming'.original text:

[...] He who cannot obey himself is commanded...

The devotion of the greatest is to encounter risk and danger, and play dice for death...

And life itself confided this secret to me: "Behold," it said, "I am that which must always overcome itself."...

Indeed, the truth was not hit by him who shot at it with the word of the "will to existence": that will does not exist. For, what does not exist cannot will; but what is in existence, how could that still want existence? Only where there is life is there also will: not will to life but—thus I teach you—will to power... And whoever must be a creator in good and evil, verily, he must first be an annihilator and break values. Thus the highest evil belongs to the highest goodness: but this is creative. [...]

about the quoted person:german philosopher, well-known for his critique on christianity and systemised philosophy.see friedrich nietzsche for a comprehensive biography.by this quote nietzsche describes his idea of the 'strongman' or 'übermensch': someone who has overcome his anxiety for death and danger and breaks all christian values, like 'you shall not kill'. therefore, killing means breaking free from an old morality and means therefore creating.