Without the errors which are active in every psychical pleasure and displeasrue a humanity would never have come into existence--whose fundamental feeling is and remains that man is the free being in a world of unfreedom, the external miracle worker whether he does good or ill, the astonishing exception, the superbeast and almost-god, the meaning of creation which cannot be thought away, the solution of the cosmic riddle, the mighty ruler over nature and the despiser of it, the creature which calls its history world history!--Vanitas vanitatum homo.

J. In the following few days Nietzsche sent short writings—known as the Wahnbriefe ("Madness Letters")—to a number of friends (including Cosima Wagner and Jacob Burckhardt). Now with the new style of Zarathustra his work became even more alienating and the market received it only to the degree required by politeness.

Nietzsche's key ideas include the "death of God" the Übermensch the eternal recurrence the Apollonian and Dionysian dichotomy perspectivism and the will to power. His sister Elisabeth Förster-Nietzsche acted as curator and editor of Nietzsche's manuscripts during his illness. [citation needed].