Die fröhliche Wissenschaft
The thought of eternal recurrence appears in a few of his works, in particular §285 and §341 of "The Gay Science" and then in "Thus Spoke Zarathustra". The most complete treatment of the subject appears in the work entitled "Notes on the Eternal Recurrence", a work which was published in 2007 alongside Søren Kierkegaard's own version of eternal return, which he calls 'repetition'. Nietzsche sums up his thought most succinctly when he addresses the reader with: "Everything has returned. Sirius, and the spider, and thy thoughts at this moment, and this last thought of thine that all things will return". However, he also expresses his thought at greater length when he says to his reader: