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Themes

Nietzsche injects myriad ideas into the book, but there are a few recurring themes. The overman (Übermensch), a self-mastered individual who has achieved his full power, is an almost omnipresent idea in Thus Spoke Zarathustra. Man as a race is merely a bridge between animals and the overman. Nietzsche also makes a point that the overman is not an end result for a person, but more the journey toward self-mastery.

The eternal recurrence, found elsewhere in Nietzsche's writing, is also mentioned. The eternal recurrence is the idea that all events that have happened will happen again, infinitely many times. Such a reality can serve as the litmus test for an overman. Faced with the knowledge that he would repeat every action that he has taken, an overman would be elated as he has no regrets and loves life.

The will to power is the fundamental component of human nature. Everything we do is an expression of the will to power. The will to power is a psychological analysis of all human action and is accentuated by self-overcoming and self-enhancement. Contrasted with living for procreation, pleasure, or happiness, the will to power is the summary of all man's struggle against his surrounding environment as well as his reason for living in it.

Copious criticisms of Christianity can be found in Thus Spoke Zarathustra, in particular Christian values of good and evil and its belief in an afterlife. Nietzsche sees the complacency of Christian values as fetters to the achievement of overman as well as on the human spirit.