Thus Spake Zarathustra ( translated by Thomas Common) by Friedrich W. Nietzsche

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.