Thus Spake Zarathustra A book for all and none

by Friedrich Nietzsche

"The fundamental idea of my work—namely, the Eternal Recurrence of all things—this highest of all possible formulae of a Yea-saying philosophy, first occurred to me in August 1881. I made a note of the thought on a sheet of paper, with the postscript: 6,000 feet beyond men and time! That day I happened to be wandering through the woods alongside of the lake of Silvaplana, and I halted beside a huge, pyramidal and towering rock not far from Surlei. It was then that the thought struck me. Looking back now, I find that exactly two months previous to this inspiration, I had had an omen of its coming in the form of a sudden and decisive alteration in my tastes—more particularly in music. It would even be possible to consider all 'Zarathustra' as a musical composition. At all events, a very necessary condition in its production was a renaissance in myself of the art of hearing. In a small mountain resort (Recoaro) near Vicenza, where I spent the spring of 1881, I and my friend and Maestro, Peter Gast—also one who had been born again—discovered that the phoenix music that hovered over us, wore lighter and brighter plumes than it had done theretofore."

“The eternal recurrence of things” as a poetic synonym for things occurring in similar patterns across all phenomena and knowledge domains.